[Bug web/64968] Upgrade GCC Bugzilla to 5.0

[LpSolit at netscape dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64968

--- Comment #6 from Frédéric Buclin <LpSolit at netscape dot net> ---
Created attachment 34735
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34735&action=edit
GCC patch for 5.0, v1

No code changes compared to 4.4, but the patch for 4.4 didn't apply cleanly to
5.0 due to some context changes. So I rediffed it again, now using git.