[Bug other/108276] libiberty unlink_if_ordinary does not handle Windows nul device correctly

[i.nixman at autistici dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108276

--- Comment #3 from niXman <i.nixman at autistici dot org> ---
and I propose to use `strcasecmp()`