libsoup branched for 2.24

[Dan Winship <danw gnome org>]

I branched libsoup for 2.24. (Actually, I did this last week and just
never sent mail.) Someone already updated jhbuild. Not cc'ing docs and
i18n since libsoup has neither.

Plans for 2.26: unclear. The burst of activity around
libsoup+webkit+epiphany last spring that then quickly died out seems to
have possibly suddenly picked up again, so maybe more of that will end
up happening this time.

-- Dan