Change libproxy branch to tag

Libproxy is a SVN repository, so when checking out a tag we have to
specify tag instead of revision.
Preserve previous $CFLAGS for liboil

If the existing CFLAGS are clobbered and replaced with
-DHAVE_SYMBOL_UNDERSCORE, then a 64-bit compiler will be used on
a 64-bit system even if a 32-bit compiler has been specified. This
causes the build to fail when it tries to compile 32-bit assembly
language.
Remove gstreamer-common

gstreamer-common is meant to be checked out as a submodule of the
various gstreamer repos, not as a separate module - it doesn't build
by itself.

Also, fixed a typo.
Merge pull request #15 from ptomato/patch-4

Remove gstreamer-common
Merge pull request #14 from ptomato/patch-liboil

Preserve previous $CFLAGS for liboil
Merge pull request #13 from ptomato/patch-3

Change libproxy branch to tag
Fix typo in stable.harbuzz, add deps in other harfbuzzes
Update gtk+-3.0; fixes disappearing scrollbar slider.
Make libgnome-keyring dependencies consistent across modules
Update core modules to latest release
Adapt libglade to newer glibs with a separate gmodule.pc
Build python with our expat instead of the built-in one

Gtk-doc-utils doesn't work with the python-provided one.
Fix typos in stable random modules
Fix http://git.gnome.org redirecting to https
Add md5 hash for icon-naming-utils
Add md5 hash for tango-icon-theme
Merge pull request #16 from cas--/master

Fix BASEURL in gtk-osx-build-setup and add hashes to gtk-osx-themes.modules
Update pango to new 1.34.0

Fixes threading deadlock in 1.32.6.
Update iso-codes; debian took down the old version as usual.
Fix typo in patch entry