Bugzilla versioning is complicated. We are on the 5.0.4 branch.  And
sourceware.org and gcc.gnu.org have slightly different patches. But
they are very close. We did pick up various patches from others.

The reason the 5.0.4 branch is still active is because there was
complete reformatting of the source code and a database schema change.
So upgrading is a bit of a pain.

We should pick a branch/version we want to upgrade to.
See also https://www.bugzilla.org/blog/#upcoming-releases
And make sure all patches/extras we want (e.g. sitemaps, various patches
we picked up from e.g. gentoo) are also on that version.

When upgrading (and having to change the schema anyway) we might want to
look into using a separate mysql database (patchwork, bugzilla, mnogosearch
share the same atm).