[Bug libstdc++/99453] libstdc++*-gdb.py installation depends on library naming

[ross at burtonini dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99453

--- Comment #10 from Ross Burton <ross at burtonini dot com> ---
I can confirm that before this fix the file was called libstdc++.a-gdb.py