Supporting passing .rc and .res files on command line

[Peter0x44]

Currently, GCC has this open as a feature request:
https://gcc.gnu.org/PR108866

For allowing passing .rc and .res files on the command line as any other source file would be able to.

This isn't implemented yet, but I still think it's an area to watch as a source of any other potential incompatibilities with GCC, and maybe giving some input if necessary.