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

[redi at gcc dot gnu.org via Gcc-bugs]

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

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Thanks! I think we just need to use the old_library name if library_names is
empty.