ld: Unify the directory separator on Windows

This patch is a spin-off of the following discussion:
https://inbox.sourceware.org/binutils/20260717101723.1022175-1-jdx@o2.pl/

There is no need to use backslashes on Windows, as Windows handles forward
slashes in paths quite well. Moreover, the linker has been using
forward slashes on Windows for a long time.

Signed-off-by: Jan Dubiec <jdx@o2.pl>
8 files changed