make executable build.cmd at cygwin enviroment (#34262)
make executable build.cmd at cygwin enviroment (#34262)


ericstj/corefx,ptoonen/corefx,ViktorHofer/corefx,ptoonen/corefx,ericstj/corefx,wtgodbe/corefx,ViktorHofer/corefx,ViktorHofer/corefx,ptoonen/corefx,shimingsg/corefx,shimingsg/corefx,ptoonen/corefx,ViktorHofer/corefx,ptoonen/corefx,ViktorHofer/corefx,ViktorHofer/corefx,wtgodbe/corefx,shimingsg/corefx,shimingsg/corefx,ericstj/corefx,wtgodbe/corefx,ericstj/corefx,wtgodbe/corefx,BrennanConroy/corefx,BrennanConroy/corefx,ericstj/corefx,BrennanConroy/corefx,shimingsg/corefx,wtgodbe/corefx,ericstj/corefx,shimingsg/corefx,shimingsg/corefx,ViktorHofer/corefx,ericstj/corefx,ptoonen/corefx,ptoonen/corefx,wtgodbe/corefx,wtgodbe/corefx