Make `gimli` / `addr2line` optional on windows

[Jasper-Bekkers]

Right now gimli is always compiled in it looks like. However, since it only targets DWARF, I think it could be an optional feature on windows.

On our windows builds we seem to be spending a good ~15 seconds building gimli (since addr2line needs it) without actually every needing or using it.

[workingjubilee]

If a PR is submitted adding the appropriate cfg and diligently modularizing the relevant code, we will likely accept it.

[klensy]

Should be fixed by #543