Gtk2Hs: Point release for many packages today!

A number of packages have undergone a point release today: cairo, glib, gstreamer, gtk2hs-buildtools, gtksourceview2, svgcairo, and webkit. The only changes are to allow these packages to build on a wider variety of GHC, gtk, and cabal-install version mixtures. Thanks to Sergei Trofimovich and Christian Maeder for contributing to this mini-release!