fix binutils instance clashes in MacOS.

[Mas0nShi]

Homebrew/homebrew-core#79874

Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /opt/homebrew
Could not symlink lib/bfd-plugins/libdep.so
Target /opt/homebrew/lib/bfd-plugins/libdep.so
is a symlink belonging to binutils-aarch64. You can unlink it:
  brew unlink binutils-aarch64

To force the link and overwrite all conflicting files:
  brew link --overwrite binutils-amd64

To list all files that would be deleted:
  brew link --overwrite --dry-run binutils-amd64

Possible conflicting files are:
/opt/homebrew/lib/bfd-plugins/libdep.so -> /opt/homebrew/Cellar/binutils-aarch64/2.38/lib/bfd-plugins/libdep.so

[peace-maker]

I don't have a mac to verify this, so any help is welcomed!

[Arusekk]

Shouldn't libdir be something like PREFIX/aarch64-linux-gnu/lib ?