Modify the line 315 of rom_sbs.pl to access cpp.exe when not building for Unicode.
EXPORTS
CancelBeepSequence__6MiscHw @ 1 NONAME ; MiscHw::CancelBeepSequence(void)
PlayBeepSequence__6MiscHwPCiiPFPv_vPv @ 2 NONAME ; MiscHw::PlayBeepSequence(int const *, int, void (*)(void *), void *)
SetSoundDriverRecording__6MiscHwi @ 3 NONAME ; MiscHw::SetSoundDriverRecording(int)