[Bug libgcc/63684] Build failure due to "Let GDB reuse GCC's parser."

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63684

--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That is weird, because actually the objdir subdir of srcdir case is what works
fine and is daily tested, and objdir == srcdir case is the problematic case
that often doesn't work.