Add default CMake installation path to probe script.
Add default CMake installation path to probe script.

CMake 3.5+ MSI-based installations no longer write the installation
directory to the registry.  To work around this I have added the default
installation directory to the probing logic.

iamjasonp/corefx,cydhaselton/corefx,jlin177/corefx,pallavit/corefx,dotnet-bot/corefx,krytarowski/corefx,tstringer/corefx,axelheer/corefx,mazong1123/corefx,stephenmichaelf/corefx,zhenlan/corefx,ellismg/corefx,dotnet-bot/corefx,rahku/corefx,ericstj/corefx,nbarbettini/corefx,ellismg/corefx,nbarbettini/corefx,Ermiar/corefx,lggomez/corefx,krytarowski/corefx,axelheer/corefx,Jiayili1/corefx,jhendrixMSFT/corefx,elijah6/corefx,seanshpark/corefx,JosephTremoulet/corefx,rahku/corefx,zhenlan/corefx,krk/corefx,marksmeltzer/corefx,gkhanna79/corefx,adamralph/corefx,fgreinacher/corefx,SGuyGe/corefx,elijah6/corefx,shmao/corefx,YoupHulsebos/corefx,yizhang82/corefx,nchikanov/corefx,parjong/corefx,the-dwyer/corefx,rubo/corefx,tijoytom/corefx,the-dwyer/corefx,axelheer/corefx,rjxby/corefx,MaggieTsang/corefx,billwert/corefx,nbarbettini/corefx,parjong/corefx,JosephTremoulet/corefx,SGuyGe/corefx,adamralph/corefx,tstringer/corefx,gkhanna79/corefx,seanshpark/corefx,YoupHulsebos/corefx,nchikanov/corefx,alexperovich/corefx,the-dwyer/corefx,shimingsg/corefx,Priya91/corefx-1,tstringer/corefx,YoupHulsebos/corefx,dhoehna/corefx,alphonsekurian/corefx,manu-silicon/corefx,twsouthwick/corefx,yizhang82/corefx,manu-silicon/corefx,yizhang82/corefx,jhendrixMSFT/corefx,Chrisboh/corefx,iamjasonp/corefx,fgreinacher/corefx,krk/corefx,ravimeda/corefx,alphonsekurian/corefx,axelheer/corefx,rjxby/corefx,shahid-pk/corefx,ViktorHofer/corefx,shimingsg/corefx,rjxby/corefx,weltkante/corefx,MaggieTsang/corefx,yizhang82/corefx,lggomez/corefx,Jiayili1/corefx,jhendrixMSFT/corefx,tstringer/corefx,SGuyGe/corefx,shimingsg/corefx,mmitche/corefx,pallavit/corefx,dhoehna/corefx,weltkante/corefx,zhenlan/corefx,alexperovich/corefx,krk/corefx,dsplaisted/corefx,the-dwyer/corefx,mazong1123/corefx,khdang/corefx,Petermarcu/corefx,ViktorHofer/corefx,jlin177/corefx,alphonsekurian/corefx,ravimeda/corefx,JosephTremoulet/corefx,mmitche/corefx,JosephTremoulet/corefx,YoupHulsebos/corefx,DnlHarvey/corefx,Chrisboh/corefx,Ermiar/corefx,nchikanov/corefx,manu-silicon/corefx,fgreinacher/corefx,wtgodbe/corefx,rubo/corefx,cartermp/corefx,axelheer/corefx,jcme/corefx,Priya91/corefx-1,elijah6/corefx,nchikanov/corefx,krk/corefx,cydhaselton/corefx,dsplaisted/corefx,gkhanna79/corefx,parjong/corefx,nbarbettini/corefx,manu-silicon/corefx,shmao/corefx,Priya91/corefx-1,Ermiar/corefx,richlander/corefx,stone-li/corefx,YoupHulsebos/corefx,tijoytom/corefx,stephenmichaelf/corefx,manu-silicon/corefx,ericstj/corefx,ViktorHofer/corefx,weltkante/corefx,shimingsg/corefx,khdang/corefx,mazong1123/corefx,tijoytom/corefx,stephenmichaelf/corefx,cydhaselton/corefx,Priya91/corefx-1,wtgodbe/corefx,mmitche/corefx,shimingsg/corefx,parjong/corefx,krk/corefx,nchikanov/corefx,mazong1123/corefx,mmitche/corefx,DnlHarvey/corefx,Priya91/corefx-1,Petermarcu/corefx,krytarowski/corefx,axelheer/corefx,manu-silicon/corefx,zhenlan/corefx,lggomez/corefx,cydhaselton/corefx,shahid-pk/corefx,adamralph/corefx,iamjasonp/corefx,stephenmichaelf/corefx,ViktorHofer/corefx,shmao/corefx,elijah6/corefx,DnlHarvey/corefx,khdang/corefx,stone-li/corefx,pallavit/corefx,seanshpark/corefx,rahku/corefx,BrennanConroy/corefx,lggomez/corefx,MaggieTsang/corefx,marksmeltzer/corefx,krytarowski/corefx,wtgodbe/corefx,zhenlan/corefx,rubo/corefx,tijoytom/corefx,stephenmichaelf/corefx,rjxby/corefx,Chrisboh/corefx,jcme/corefx,shahid-pk/corefx,rjxby/corefx,Chrisboh/corefx,shmao/corefx,alexperovich/corefx,SGuyGe/corefx,yizhang82/corefx,richlander/corefx,stone-li/corefx,tijoytom/corefx,cydhaselton/corefx,Ermiar/corefx,ravimeda/corefx,krk/corefx,Petermarcu/corefx,shmao/corefx,Jiayili1/corefx,alexperovich/corefx,ptoonen/corefx,gkhanna79/corefx,cydhaselton/corefx,billwert/corefx,shimingsg/corefx,seanshpark/corefx,ptoonen/corefx,cartermp/corefx,nbarbettini/corefx,MaggieTsang/corefx,gkhanna79/corefx,Petermarcu/corefx,yizhang82/corefx,DnlHarvey/corefx,Ermiar/corefx,gkhanna79/corefx,ellismg/corefx,mmitche/corefx,marksmeltzer/corefx,mazong1123/corefx,ptoonen/corefx,BrennanConroy/corefx,zhenlan/corefx,ravimeda/corefx,weltkante/corefx,Jiayili1/corefx,jlin177/corefx,jhendrixMSFT/corefx,mazong1123/corefx,ravimeda/corefx,billwert/corefx,wtgodbe/corefx,BrennanConroy/corefx,cartermp/corefx,wtgodbe/corefx,dhoehna/corefx,tstringer/corefx,Petermarcu/corefx,twsouthwick/corefx,pallavit/corefx,jlin177/corefx,seanshpark/corefx,ericstj/corefx,dotnet-bot/corefx,khdang/corefx,parjong/corefx,richlander/corefx,stone-li/corefx,gkhanna79/corefx,jhendrixMSFT/corefx,SGuyGe/corefx,ericstj/corefx,cartermp/corefx,the-dwyer/corefx,alphonsekurian/corefx,marksmeltzer/corefx,billwert/corefx,Chrisboh/corefx,krytarowski/corefx,jhendrixMSFT/corefx,iamjasonp/corefx,dotnet-bot/corefx,Jiayili1/corefx,rubo/corefx,ravimeda/corefx,shmao/corefx,iamjasonp/corefx,yizhang82/corefx,tstringer/corefx,rjxby/corefx,elijah6/corefx,billwert/corefx,marksmeltzer/corefx,ptoonen/corefx,jlin177/corefx,jlin177/corefx,ViktorHofer/corefx,SGuyGe/corefx,rubo/corefx,DnlHarvey/corefx,Petermarcu/corefx,alexperovich/corefx,krytarowski/corefx,krk/corefx,cartermp/corefx,the-dwyer/corefx,stone-li/corefx,DnlHarvey/corefx,ericstj/corefx,YoupHulsebos/corefx,dotnet-bot/corefx,weltkante/corefx,ellismg/corefx,Ermiar/corefx,richlander/corefx,ptoonen/corefx,parjong/corefx,seanshpark/corefx,shimingsg/corefx,fgreinacher/corefx,nchikanov/corefx,JosephTremoulet/corefx,khdang/corefx,nbarbettini/corefx,twsouthwick/corefx,zhenlan/corefx,jlin177/corefx,khdang/corefx,dotnet-bot/corefx,rjxby/corefx,rahku/corefx,jcme/corefx,billwert/corefx,mmitche/corefx,stephenmichaelf/corefx,billwert/corefx,ravimeda/corefx,wtgodbe/corefx,jhendrixMSFT/corefx,ericstj/corefx,mazong1123/corefx,parjong/corefx,ViktorHofer/corefx,manu-silicon/corefx,shahid-pk/corefx,ptoonen/corefx,alphonsekurian/corefx,nchikanov/corefx,elijah6/corefx,elijah6/corefx,MaggieTsang/corefx,stone-li/corefx,ViktorHofer/corefx,tijoytom/corefx,rahku/corefx,lggomez/corefx,shmao/corefx,Chrisboh/corefx,ellismg/corefx,dsplaisted/corefx,twsouthwick/corefx,iamjasonp/corefx,rahku/corefx,YoupHulsebos/corefx,alexperovich/corefx,alphonsekurian/corefx,twsouthwick/corefx,richlander/corefx,weltkante/corefx,lggomez/corefx,mmitche/corefx,dhoehna/corefx,dhoehna/corefx,rahku/corefx,Priya91/corefx-1,jcme/corefx,shahid-pk/corefx,dhoehna/corefx,MaggieTsang/corefx,twsouthwick/corefx,seanshpark/corefx,alphonsekurian/corefx,nbarbettini/corefx,Jiayili1/corefx,the-dwyer/corefx,ellismg/corefx,richlander/corefx,wtgodbe/corefx,lggomez/corefx,stephenmichaelf/corefx,dotnet-bot/corefx,jcme/corefx,dhoehna/corefx,cartermp/corefx,Petermarcu/corefx,marksmeltzer/corefx,JosephTremoulet/corefx,twsouthwick/corefx,ptoonen/corefx,MaggieTsang/corefx,pallavit/corefx,stone-li/corefx,krytarowski/corefx,Jiayili1/corefx,ericstj/corefx,jcme/corefx,Ermiar/corefx,alexperovich/corefx,JosephTremoulet/corefx,cydhaselton/corefx,shahid-pk/corefx,DnlHarvey/corefx,iamjasonp/corefx,pallavit/corefx,tijoytom/corefx,weltkante/corefx,marksmeltzer/corefx,richlander/corefx