Add configuration option to the base/rom extension to make the toolchain (ARMCC/GCCE) known to the preprocessor stage of romb build.
@rem Used by the buildbot "compile" step.
cmd /c Tools\buildbot\external.bat
call "%VS90COMNTOOLS%vsvars32.bat"
cmd /c Tools\buildbot\clean.bat
vcbuild /useenv PCbuild\kill_python.vcproj "Debug|Win32" && PCbuild\kill_python_d.exe
vcbuild /useenv PCbuild\pcbuild.sln "Debug|Win32"