[Bug libstdc++/108225] cross build gdb error for libstdc++'s std_mutex.h on x86_64-w64-mingw32 host

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108225

--- Comment #2 from cqwrteur <unlvsur at live dot com> ---
Created attachment 54171
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54171&action=edit
Error message

This is an example of how incorrectly discarding the support of old systems
would randomly cause build issues.

Please stop! Windows 95 support is extremely important