Support gcc for build-test.sh
Support gcc for build-test.sh

poizan42/coreclr,krk/coreclr,wtgodbe/coreclr,krk/coreclr,poizan42/coreclr,cshung/coreclr,cshung/coreclr,poizan42/coreclr,poizan42/coreclr,cshung/coreclr,wtgodbe/coreclr,poizan42/coreclr,krk/coreclr,wtgodbe/coreclr,krk/coreclr,wtgodbe/coreclr,cshung/coreclr,cshung/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,krk/coreclr,poizan42/coreclr,cshung/coreclr,krk/coreclr