Add configuration option to the base/rom extension to make the toolchain (ARMCC/GCCE) known to the preprocessor stage of romb build.
# /OPT: REF and ICF are added by VS.NET by default
msisupport.dll: msisupport.obj
link.exe /OUT:msisupport.dll /INCREMENTAL:NO /NOLOGO /DLL /SUBSYSTEM:WINDOWS /OPT:REF /OPT:ICF msisupport.obj msi.lib kernel32.lib
# We request a static CRT, so that there will be no CRT dependencies
# for the target system. We cannot do without a CRT, since it provides
# the DLL entry point.
msisupport.obj: msisupport.c
cl /O2 /D WIN32 /D NDEBUG /D _WINDOWS /MT /W3 /c msisupport.c