Fix build script to use default web proxy to download remote files.
Fix build script to use default web proxy to download remote files.

Chrisboh/corefx,vijaykota/corefx,billwert/corefx,690486439/corefx,dmitry-shechtman/corefx,mazong1123/corefx,stone-li/corefx,s0ne0me/corefx,vs-team/corefx,tstringer/corefx,bitcrazed/corefx,jmhardison/corefx,YoupHulsebos/corefx,chenxizhang/corefx,destinyclown/corefx,pgavlin/corefx,shrutigarg/corefx,weltkante/corefx,rajansingh10/corefx,Winsto/corefx,kkurni/corefx,fffej/corefx,the-dwyer/corefx,DnlHarvey/corefx,dtrebbien/corefx,rjxby/corefx,billwert/corefx,josguil/corefx,comdiv/corefx,brett25/corefx,chenkennt/corefx,shiftkey-tester/corefx,cydhaselton/corefx,zmaruo/corefx,angel666777/corefx,axelheer/corefx,n1ghtmare/corefx,manu-silicon/corefx,richlander/corefx,seanshpark/corefx,wtgodbe/corefx,mellinoe/corefx,billwert/corefx,heXelium/corefx,alphonsekurian/corefx,seanshpark/corefx,zhenlan/corefx,wtgodbe/corefx,erpframework/corefx,shimingsg/corefx,ViktorHofer/corefx,kkurni/corefx,lggomez/corefx,cartermp/corefx,PatrickMcDonald/corefx,khdang/corefx,viniciustaveira/corefx,stephenmichaelf/corefx,dmitry-shechtman/corefx,lggomez/corefx,Jiayili1/corefx,gregg-miskelly/corefx,ericstj/corefx,ericstj/corefx,rjxby/corefx,pgavlin/corefx,fgreinacher/corefx,dsplaisted/corefx,vijaykota/corefx,690486439/corefx,Sridhar-MS/corefx,alphonsekurian/corefx,MaggieTsang/corefx,KrisLee/corefx,larsbj1988/corefx,shimingsg/corefx,shmao/corefx,Priya91/corefx-1,CherryCxldn/corefx,zhenlan/corefx,mokchhya/corefx,dotnet-bot/corefx,krk/corefx,brett25/corefx,lggomez/corefx,larsbj1988/corefx,jeremymeng/corefx,gregg-miskelly/corefx,jlin177/corefx,josguil/corefx,jmhardison/corefx,fffej/corefx,pgavlin/corefx,ericstj/corefx,contoso-dnf-a/corefx,tijoytom/corefx,rjxby/corefx,matthubin/corefx,weltkante/corefx,lggomez/corefx,cartermp/corefx,zhenlan/corefx,jcme/corefx,FreakyKuma/corefx,krytarowski/corefx,ViktorHofer/corefx,weltkante/corefx,spoiledsport/corefx,rajansingh10/corefx,0xMF/corefx,larsbj1988/corefx,VPashkov/corefx,nelsonsar/corefx,ravimeda/corefx,bitcrazed/corefx,ellismg/corefx,ViktorHofer/corefx,Chrisboh/corefx,manu-silicon/corefx,rahku/corefx,Ermiar/corefx,contoso-dnf-a/corefx,stephenmichaelf/corefx,CloudLens/corefx,richlander/corefx,YoupHulsebos/corefx,jlin177/corefx,arronei/corefx,rahku/corefx,andyhebear/corefx,dkorolev/corefx,elijah6/corefx,Ermiar/corefx,DnlHarvey/corefx,cnbin/corefx,wtgodbe/corefx,weltkante/corefx,andyhebear/corefx,Jiayili1/corefx,benpye/corefx,josguil/corefx,benjamin-bader/corefx,MaggieTsang/corefx,nbarbettini/corefx,mafiya69/corefx,rajansingh10/corefx,fernando-rodriguez/corefx,gregg-miskelly/corefx,alexperovich/corefx,uhaciogullari/corefx,PatrickMcDonald/corefx,zmaruo/corefx,marksmeltzer/corefx,jlin177/corefx,chenxizhang/corefx,Chrisboh/corefx,mafiya69/corefx,jhendrixMSFT/corefx,shahid-pk/corefx,s0ne0me/corefx,twsouthwick/corefx,josguil/corefx,nchikanov/corefx,tijoytom/corefx,zhangwenquan/corefx,matthubin/corefx,vidhya-bv/corefx-sorting,Winsto/corefx,spoiledsport/corefx,kkurni/corefx,ellismg/corefx,uhaciogullari/corefx,Sridhar-MS/corefx,Frank125/corefx,ViktorHofer/corefx,benpye/corefx,tstringer/corefx,jmhardison/corefx,mafiya69/corefx,adamralph/corefx,heXelium/corefx,dhoehna/corefx,YoupHulsebos/corefx,parjong/corefx,vijaykota/corefx,mmitche/corefx,Ermiar/corefx,alexandrnikitin/corefx,heXelium/corefx,shimingsg/corefx,mmitche/corefx,gkhanna79/corefx,benjamin-bader/corefx,khdang/corefx,krk/corefx,JosephTremoulet/corefx,stone-li/corefx,FiveTimesTheFun/corefx,rahku/corefx,wtgodbe/corefx,shmao/corefx,DnlHarvey/corefx,Alcaro/corefx,tijoytom/corefx,vidhya-bv/corefx-sorting,rubo/corefx,Chrisboh/corefx,krk/corefx,krytarowski/corefx,alexandrnikitin/corefx,stephenmichaelf/corefx,VPashkov/corefx,alexandrnikitin/corefx,shana/corefx,dhoehna/corefx,parjong/corefx,Jiayili1/corefx,kkurni/corefx,iamjasonp/corefx,cnbin/corefx,seanshpark/corefx,anjumrizwi/corefx,MaggieTsang/corefx,fffej/corefx,axelheer/corefx,mellinoe/corefx,mmitche/corefx,Jiayili1/corefx,scott156/corefx,erpframework/corefx,parjong/corefx,Priya91/corefx-1,khdang/corefx,scott156/corefx,nbarbettini/corefx,FreakyKuma/corefx,jeremymeng/corefx,Ermiar/corefx,claudelee/corefx,axelheer/corefx,jorik041/corefx,rubo/corefx,billwert/corefx,krytarowski/corefx,jhendrixMSFT/corefx,dhoehna/corefx,fgreinacher/corefx,viniciustaveira/corefx,brett25/corefx,nchikanov/corefx,alphonsekurian/corefx,gkhanna79/corefx,Frank125/corefx,Jiayili1/corefx,Petermarcu/corefx,seanshpark/corefx,Priya91/corefx-1,stormleoxia/corefx,comdiv/corefx,pallavit/corefx,cydhaselton/corefx,fernando-rodriguez/corefx,oceanho/corefx,rjxby/corefx,nchikanov/corefx,huanjie/corefx,iamjasonp/corefx,YoupHulsebos/corefx,yizhang82/corefx,jcme/corefx,mazong1123/corefx,alexperovich/corefx,SGuyGe/corefx,stormleoxia/corefx,chaitrakeshav/corefx,JosephTremoulet/corefx,axelheer/corefx,mafiya69/corefx,mellinoe/corefx,jlin177/corefx,nelsonsar/corefx,shahid-pk/corefx,Frank125/corefx,uhaciogullari/corefx,zhangwenquan/corefx,destinyclown/corefx,bpschoch/corefx,vrassouli/corefx,shimingsg/corefx,ericstj/corefx,ravimeda/corefx,arronei/corefx,EverlessDrop41/corefx,cnbin/corefx,angel666777/corefx,parjong/corefx,0xMF/corefx,ellismg/corefx,mafiya69/corefx,chaitrakeshav/corefx,Petermarcu/corefx,seanshpark/corefx,Petermarcu/corefx,huanjie/corefx,Priya91/corefx-1,benjamin-bader/corefx,khdang/corefx,s0ne0me/corefx,alphonsekurian/corefx,jcme/corefx,krytarowski/corefx,scott156/corefx,andyhebear/corefx,erpframework/corefx,lggomez/corefx,stephenmichaelf/corefx,SGuyGe/corefx,gabrielPeart/corefx,jcme/corefx,rahku/corefx,elijah6/corefx,khdang/corefx,gkhanna79/corefx,MaggieTsang/corefx,weltkante/corefx,the-dwyer/corefx,stone-li/corefx,fffej/corefx,YoupHulsebos/corefx,JosephTremoulet/corefx,benpye/corefx,alexandrnikitin/corefx,elijah6/corefx,gkhanna79/corefx,misterzik/corefx,iamjasonp/corefx,rjxby/corefx,jlin177/corefx,akivafr123/corefx,misterzik/corefx,dkorolev/corefx,alphonsekurian/corefx,dotnet-bot/corefx,chaitrakeshav/corefx,the-dwyer/corefx,jeremymeng/corefx,iamjasonp/corefx,ericstj/corefx,shawnhar/corefx,wtgodbe/corefx,benjamin-bader/corefx,mazong1123/corefx,angel666777/corefx,fgreinacher/corefx,shimingsg/corefx,heXelium/corefx,DnlHarvey/corefx,gregg-miskelly/corefx,JosephTremoulet/corefx,ptoonen/corefx,jhendrixMSFT/corefx,jhendrixMSFT/corefx,stone-li/corefx,ravimeda/corefx,VPashkov/corefx,janhenke/corefx,destinyclown/corefx,weltkante/corefx,MaggieTsang/corefx,comdiv/corefx,shawnhar/corefx,690486439/corefx,mokchhya/corefx,vidhya-bv/corefx-sorting,comdiv/corefx,the-dwyer/corefx,chenxizhang/corefx,cartermp/corefx,JosephTremoulet/corefx,ViktorHofer/corefx,alphonsekurian/corefx,dotnet-bot/corefx,janhenke/corefx,n1ghtmare/corefx,manu-silicon/corefx,elijah6/corefx,alexperovich/corefx,manu-silicon/corefx,shmao/corefx,shmao/corefx,YoupHulsebos/corefx,gkhanna79/corefx,twsouthwick/corefx,pallavit/corefx,rubo/corefx,mmitche/corefx,popolan1986/corefx,richlander/corefx,ptoonen/corefx,mokchhya/corefx,DnlHarvey/corefx,dkorolev/corefx,pallavit/corefx,ViktorHofer/corefx,yizhang82/corefx,FiveTimesTheFun/corefx,stone-li/corefx,lydonchandra/corefx,cydhaselton/corefx,JosephTremoulet/corefx,vrassouli/corefx,n1ghtmare/corefx,dotnet-bot/corefx,zhenlan/corefx,huanjie/corefx,marksmeltzer/corefx,akivafr123/corefx,anjumrizwi/corefx,Yanjing123/corefx,KrisLee/corefx,nchikanov/corefx,BrennanConroy/corefx,benpye/corefx,CherryCxldn/corefx,ellismg/corefx,CherryCxldn/corefx,parjong/corefx,marksmeltzer/corefx,stephenmichaelf/corefx,Yanjing123/corefx,Priya91/corefx-1,tstringer/corefx,weltkante/corefx,ravimeda/corefx,bitcrazed/corefx,lydonchandra/corefx,rubo/corefx,uhaciogullari/corefx,scott156/corefx,tstringer/corefx,xuweixuwei/corefx,alexandrnikitin/corefx,alphonsekurian/corefx,jhendrixMSFT/corefx,SGuyGe/corefx,wtgodbe/corefx,dotnet-bot/corefx,ellismg/corefx,dtrebbien/corefx,mmitche/corefx,nchikanov/corefx,kyulee1/corefx,dotnet-bot/corefx,gkhanna79/corefx,mazong1123/corefx,tijoytom/corefx,zmaruo/corefx,erpframework/corefx,KrisLee/corefx,mazong1123/corefx,oceanho/corefx,Jiayili1/corefx,andyhebear/corefx,kyulee1/corefx,seanshpark/corefx,KrisLee/corefx,janhenke/corefx,Chrisboh/corefx,oceanho/corefx,yizhang82/corefx,brett25/corefx,JosephTremoulet/corefx,BrennanConroy/corefx,zhangwenquan/corefx,misterzik/corefx,dhoehna/corefx,chenkennt/corefx,krk/corefx,elijah6/corefx,MaggieTsang/corefx,elijah6/corefx,popolan1986/corefx,lggomez/corefx,cartermp/corefx,richlander/corefx,ptoonen/corefx,popolan1986/corefx,viniciustaveira/corefx,shana/corefx,Yanjing123/corefx,Sridhar-MS/corefx,twsouthwick/corefx,Chrisboh/corefx,nbarbettini/corefx,mazong1123/corefx,SGuyGe/corefx,tijoytom/corefx,zhenlan/corefx,pgavlin/corefx,dhoehna/corefx,adamralph/corefx,twsouthwick/corefx,mellinoe/corefx,kkurni/corefx,cydhaselton/corefx,nchikanov/corefx,shana/corefx,dotnet-bot/corefx,manu-silicon/corefx,shrutigarg/corefx,yizhang82/corefx,nbarbettini/corefx,YoupHulsebos/corefx,ptoonen/corefx,arronei/corefx,jeremymeng/corefx,gabrielPeart/corefx,vidhya-bv/corefx-sorting,oceanho/corefx,Yanjing123/corefx,Yanjing123/corefx,nelsonsar/corefx,shiftkey-tester/corefx,gabrielPeart/corefx,the-dwyer/corefx,rjxby/corefx,jlin177/corefx,jcme/corefx,Alcaro/corefx,akivafr123/corefx,zhenlan/corefx,bitcrazed/corefx,mazong1123/corefx,Petermarcu/corefx,rubo/corefx,mafiya69/corefx,Petermarcu/corefx,Petermarcu/corefx,bpschoch/corefx,shmao/corefx,Petermarcu/corefx,ellismg/corefx,vrassouli/corefx,khdang/corefx,axelheer/corefx,shmao/corefx,cartermp/corefx,pallavit/corefx,marksmeltzer/corefx,yizhang82/corefx,jhendrixMSFT/corefx,vs-team/corefx,the-dwyer/corefx,claudelee/corefx,shawnhar/corefx,alexperovich/corefx,rjxby/corefx,ravimeda/corefx,krk/corefx,ViktorHofer/corefx,shrutigarg/corefx,gabrielPeart/corefx,fernando-rodriguez/corefx,DnlHarvey/corefx,BrennanConroy/corefx,bpschoch/corefx,lydonchandra/corefx,zhangwenquan/corefx,dsplaisted/corefx,shmao/corefx,thiagodin/corefx,manu-silicon/corefx,richlander/corefx,anjumrizwi/corefx,seanshpark/corefx,Alcaro/corefx,jmhardison/corefx,nbarbettini/corefx,nbarbettini/corefx,dhoehna/corefx,EverlessDrop41/corefx,mellinoe/corefx,benpye/corefx,mokchhya/corefx,thiagodin/corefx,alexperovich/corefx,rahku/corefx,mokchhya/corefx,shahid-pk/corefx,Ermiar/corefx,cartermp/corefx,zhenlan/corefx,dkorolev/corefx,zmaruo/corefx,nelsonsar/corefx,iamjasonp/corefx,benpye/corefx,the-dwyer/corefx,dtrebbien/corefx,alexperovich/corefx,spoiledsport/corefx,Winsto/corefx,n1ghtmare/corefx,mmitche/corefx,tijoytom/corefx,marksmeltzer/corefx,nchikanov/corefx,shimingsg/corefx,benjamin-bader/corefx,alexperovich/corefx,CherryCxldn/corefx,jhendrixMSFT/corefx,shahid-pk/corefx,adamralph/corefx,jcme/corefx,pallavit/corefx,iamjasonp/corefx,shahid-pk/corefx,vrassouli/corefx,jlin177/corefx,richlander/corefx,marksmeltzer/corefx,lydonchandra/corefx,Priya91/corefx-1,shrutigarg/corefx,huanjie/corefx,CloudLens/corefx,ptoonen/corefx,rahku/corefx,matthubin/corefx,stephenmichaelf/corefx,dtrebbien/corefx,SGuyGe/corefx,vs-team/corefx,krytarowski/corefx,FiveTimesTheFun/corefx,690486439/corefx,mellinoe/corefx,tstringer/corefx,anjumrizwi/corefx,fgreinacher/corefx,twsouthwick/corefx,kyulee1/corefx,ericstj/corefx,CloudLens/corefx,0xMF/corefx,PatrickMcDonald/corefx,PatrickMcDonald/corefx,VPashkov/corefx,chaitrakeshav/corefx,matthubin/corefx,stone-li/corefx,stephenmichaelf/corefx,dhoehna/corefx,jeremymeng/corefx,Ermiar/corefx,kyulee1/corefx,Frank125/corefx,cydhaselton/corefx,richlander/corefx,parjong/corefx,dsplaisted/corefx,jorik041/corefx,tstringer/corefx,gkhanna79/corefx,nbarbettini/corefx,xuweixuwei/corefx,stone-li/corefx,ericstj/corefx,janhenke/corefx,thiagodin/corefx,billwert/corefx,janhenke/corefx,yizhang82/corefx,billwert/corefx,josguil/corefx,ptoonen/corefx,yizhang82/corefx,mokchhya/corefx,viniciustaveira/corefx,Ermiar/corefx,DnlHarvey/corefx,feilang864/Net,n1ghtmare/corefx,ravimeda/corefx,Alcaro/corefx,bitcrazed/corefx,shana/corefx,vidhya-bv/corefx-sorting,claudelee/corefx,larsbj1988/corefx,MaggieTsang/corefx,janhenke/corefx,shahid-pk/corefx,twsouthwick/corefx,stormleoxia/corefx,690486439/corefx,feilang864/Net,mmitche/corefx,SGuyGe/corefx,manu-silicon/corefx,contoso-dnf-a/corefx,vs-team/corefx,tijoytom/corefx,parjong/corefx,shiftkey-tester/corefx,pallavit/corefx,akivafr123/corefx,rajansingh10/corefx,PatrickMcDonald/corefx,krk/corefx,akivafr123/corefx,cnbin/corefx,marksmeltzer/corefx,feilang864/Net,iamjasonp/corefx,shiftkey-tester/corefx,krytarowski/corefx,stormleoxia/corefx,s0ne0me/corefx,Jiayili1/corefx,bpschoch/corefx,cydhaselton/corefx,benjamin-bader/corefx,claudelee/corefx,chenkennt/corefx,ravimeda/corefx,wtgodbe/corefx,lggomez/corefx,twsouthwick/corefx,EverlessDrop41/corefx,cydhaselton/corefx,rahku/corefx,krytarowski/corefx,krk/corefx,xuweixuwei/corefx,thiagodin/corefx,josguil/corefx,axelheer/corefx,CloudLens/corefx,kkurni/corefx,shimingsg/corefx,elijah6/corefx,billwert/corefx,ptoonen/corefx