[gdb/build] Work around GCC ipa-modref bug

PR mi/32571 reports the following problem:
...
$ gdb -q -batch -ex "b bla.c:100"
<random output>
Make breakpoint pending on future shared library load? (y or [n]) \
  [answered N; input not from terminal]
...
while this is expected:
...
$ gdb -q -batch -ex "b bla.c:100"
No symbol table is loaded.  Use the "file" command.
Make breakpoint pending on future shared library load? (y or [n]) \
  [answered N; input not from terminal]
...

A few factors in reproducing this are building gdb using gcc 14,
"-O2 -flto=auto" and --disable-nls.  For more details, see the PR.

This turns out to be caused by a GCC PR [1], more specifically a problem in
ipa-modref.

Work around this by disabling ipa-modref for GCC versions 12-15 and 16.0,
assuming the GCC 16.1 release will contain a fix.

Tested on aarch64-linux and x86_64-linux.

Approved-By: Andrew Burgess <aburgess@redhat.com>

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32571

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120987