Support for outputting COFF object files

[squeek502]

The idea would be to match the behavior of cvtres.exe which is responsible for converting from .res to a COFF object file for linking.

• windres supports it
• LLVM has llvm-cvtres

Relevant PE format docs: https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#the-rsrc-section