Revert "Update build tools version in corefx"
Revert "Update build tools version in corefx"

This reverts commit 1b78e74bbc5a6fed516be8eaee9f7f1606d255fd.

alexperovich/corefx,alexperovich/corefx,ViktorHofer/corefx,MaggieTsang/corefx,zhenlan/corefx,wtgodbe/corefx,ravimeda/corefx,ericstj/corefx,ptoonen/corefx,yizhang82/corefx,Petermarcu/corefx,mmitche/corefx,ptoonen/corefx,Petermarcu/corefx,tijoytom/corefx,mazong1123/corefx,dhoehna/corefx,richlander/corefx,Jiayili1/corefx,nbarbettini/corefx,shimingsg/corefx,parjong/corefx,krk/corefx,Ermiar/corefx,YoupHulsebos/corefx,dhoehna/corefx,mazong1123/corefx,nchikanov/corefx,tijoytom/corefx,dotnet-bot/corefx,richlander/corefx,the-dwyer/corefx,wtgodbe/corefx,Ermiar/corefx,stephenmichaelf/corefx,krytarowski/corefx,rahku/corefx,alexperovich/corefx,parjong/corefx,richlander/corefx,weltkante/corefx,ViktorHofer/corefx,mazong1123/corefx,marksmeltzer/corefx,Jiayili1/corefx,rahku/corefx,zhenlan/corefx,YoupHulsebos/corefx,billwert/corefx,alexperovich/corefx,mmitche/corefx,JosephTremoulet/corefx,krytarowski/corefx,richlander/corefx,the-dwyer/corefx,krk/corefx,krytarowski/corefx,gkhanna79/corefx,ericstj/corefx,stephenmichaelf/corefx,rahku/corefx,rubo/corefx,axelheer/corefx,shimingsg/corefx,ericstj/corefx,stone-li/corefx,JosephTremoulet/corefx,tijoytom/corefx,dotnet-bot/corefx,parjong/corefx,twsouthwick/corefx,wtgodbe/corefx,twsouthwick/corefx,rjxby/corefx,Petermarcu/corefx,nbarbettini/corefx,elijah6/corefx,gkhanna79/corefx,weltkante/corefx,parjong/corefx,seanshpark/corefx,DnlHarvey/corefx,marksmeltzer/corefx,ravimeda/corefx,nbarbettini/corefx,stone-li/corefx,cydhaselton/corefx,Petermarcu/corefx,dotnet-bot/corefx,axelheer/corefx,DnlHarvey/corefx,seanshpark/corefx,Petermarcu/corefx,YoupHulsebos/corefx,ptoonen/corefx,elijah6/corefx,axelheer/corefx,cydhaselton/corefx,krk/corefx,gkhanna79/corefx,the-dwyer/corefx,marksmeltzer/corefx,stephenmichaelf/corefx,stephenmichaelf/corefx,the-dwyer/corefx,stephenmichaelf/corefx,ViktorHofer/corefx,mmitche/corefx,ptoonen/corefx,jlin177/corefx,rahku/corefx,Ermiar/corefx,elijah6/corefx,zhenlan/corefx,twsouthwick/corefx,jlin177/corefx,zhenlan/corefx,rubo/corefx,fgreinacher/corefx,rjxby/corefx,gkhanna79/corefx,weltkante/corefx,yizhang82/corefx,billwert/corefx,rjxby/corefx,rahku/corefx,rahku/corefx,twsouthwick/corefx,cydhaselton/corefx,zhenlan/corefx,nchikanov/corefx,rahku/corefx,stone-li/corefx,BrennanConroy/corefx,alexperovich/corefx,DnlHarvey/corefx,elijah6/corefx,rjxby/corefx,JosephTremoulet/corefx,mazong1123/corefx,dhoehna/corefx,the-dwyer/corefx,YoupHulsebos/corefx,shimingsg/corefx,billwert/corefx,tijoytom/corefx,seanshpark/corefx,cydhaselton/corefx,zhenlan/corefx,yizhang82/corefx,tijoytom/corefx,rubo/corefx,fgreinacher/corefx,ViktorHofer/corefx,nbarbettini/corefx,ericstj/corefx,richlander/corefx,Jiayili1/corefx,zhenlan/corefx,MaggieTsang/corefx,seanshpark/corefx,wtgodbe/corefx,cydhaselton/corefx,JosephTremoulet/corefx,nchikanov/corefx,dhoehna/corefx,stone-li/corefx,mmitche/corefx,Jiayili1/corefx,ravimeda/corefx,jlin177/corefx,Jiayili1/corefx,Ermiar/corefx,Ermiar/corefx,billwert/corefx,Petermarcu/corefx,mazong1123/corefx,twsouthwick/corefx,seanshpark/corefx,axelheer/corefx,nbarbettini/corefx,rjxby/corefx,krk/corefx,nbarbettini/corefx,Jiayili1/corefx,krytarowski/corefx,ravimeda/corefx,ericstj/corefx,krk/corefx,BrennanConroy/corefx,ViktorHofer/corefx,gkhanna79/corefx,krk/corefx,yizhang82/corefx,dhoehna/corefx,YoupHulsebos/corefx,MaggieTsang/corefx,DnlHarvey/corefx,krytarowski/corefx,richlander/corefx,marksmeltzer/corefx,parjong/corefx,yizhang82/corefx,elijah6/corefx,axelheer/corefx,marksmeltzer/corefx,stephenmichaelf/corefx,billwert/corefx,nchikanov/corefx,the-dwyer/corefx,cydhaselton/corefx,nchikanov/corefx,nbarbettini/corefx,twsouthwick/corefx,ptoonen/corefx,krytarowski/corefx,twsouthwick/corefx,ViktorHofer/corefx,JosephTremoulet/corefx,alexperovich/corefx,axelheer/corefx,weltkante/corefx,fgreinacher/corefx,cydhaselton/corefx,elijah6/corefx,fgreinacher/corefx,wtgodbe/corefx,YoupHulsebos/corefx,krytarowski/corefx,rubo/corefx,Petermarcu/corefx,ptoonen/corefx,alexperovich/corefx,ptoonen/corefx,rjxby/corefx,Ermiar/corefx,JosephTremoulet/corefx,DnlHarvey/corefx,ViktorHofer/corefx,MaggieTsang/corefx,shimingsg/corefx,mazong1123/corefx,dhoehna/corefx,ravimeda/corefx,mmitche/corefx,seanshpark/corefx,marksmeltzer/corefx,tijoytom/corefx,krk/corefx,jlin177/corefx,shimingsg/corefx,stone-li/corefx,parjong/corefx,seanshpark/corefx,wtgodbe/corefx,yizhang82/corefx,JosephTremoulet/corefx,richlander/corefx,YoupHulsebos/corefx,gkhanna79/corefx,gkhanna79/corefx,mmitche/corefx,DnlHarvey/corefx,jlin177/corefx,MaggieTsang/corefx,DnlHarvey/corefx,nchikanov/corefx,mmitche/corefx,Jiayili1/corefx,billwert/corefx,rubo/corefx,MaggieTsang/corefx,parjong/corefx,dotnet-bot/corefx,stephenmichaelf/corefx,the-dwyer/corefx,mazong1123/corefx,ravimeda/corefx,jlin177/corefx,wtgodbe/corefx,billwert/corefx,ericstj/corefx,dotnet-bot/corefx,ericstj/corefx,BrennanConroy/corefx,tijoytom/corefx,Ermiar/corefx,MaggieTsang/corefx,shimingsg/corefx,ravimeda/corefx,dhoehna/corefx,marksmeltzer/corefx,jlin177/corefx,weltkante/corefx,shimingsg/corefx,rjxby/corefx,elijah6/corefx,dotnet-bot/corefx,weltkante/corefx,weltkante/corefx,stone-li/corefx,nchikanov/corefx,yizhang82/corefx,stone-li/corefx,dotnet-bot/corefx