Added --gcc flag.
Added --gcc flag.

Allows choosing the command to run GCC.

schancel/SDC,bpr/SDC,JohanEngelen/SDC,UplinkCoder/SDC,DmitryOlshansky/SDC,deadalnix/SDC,UplinkCoder/SDC,sidmutha/SDC,deadalnix/SDC,JohanEngelen/SDC,bpr/SDC,SDC-Developers/SDC,SDC-Developers/SDC,bpr/SDC,schancel/SDC,sidmutha/SDC,sidmutha/SDC,DmitryOlshansky/SDC,schancel/SDC,DmitryOlshansky/SDC,UplinkCoder/SDC,JohanEngelen/SDC,deadalnix/SDC,carlor/SDC,SDC-Developers/SDC