[Bug web/64968] Upgrade GCC Bugzilla to 5.0

[trippels at gcc dot gnu.org]

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

--- Comment #18 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
One thing I've noticed is that the emails to gcc-bugs now use the local time
of the user. So the sorting isn't correct anymore if people from different
time zones comment.
(The same issue also happens on sourceware.org/bugzilla/)