libsoup freeze break request for build fixes

[Dan Winship <danw gnome org>]

For reasons that I don't understand, suddenly lots of people are running
into a problem building libsoup. There is a patch for this in
https://bugzilla.gnome.org/show_bug.cgi?id=645505 that I was going to
commit for 3.0.1, but I've since seen two more people running into the
bug, so maybe it would be good to commit it for 3.0.0.

Additionally, there's been a handful of new APIs added since 2.32, but I
forgot to bump the shared library minor version for that, so I'd like to
do that too.

-- Dan