gio-2.0: Update to 2.39.91+

Fixes bug 726057
codewriter: Emit 'unowned' keyword for local variables

Fixes bug 726312
gtk+-2.0, gtk+-3.0: Make ComboBox.set_active_iter parameter nullable

Fixes bug 726141
libpq: Add PQping enum and functions

Fixes bug 722878
Accept single ellipsis parameter for instance methods

Fixes bug 726347
Add test for bug 726347
gstreamer-1.0: Make Element.add_pad parameter unowned

Fixes bug 702960
gstreamer-1.0: Make Bin.add_many first parameter unowned

Fixes bug 702969
gstreamer-1.0: Make Bin.add first parameter unowned
x11: Add missing evtype field of GenericEventCookie
codegen: Inherit array_length and array_null_terminated of methods

Fixes bug 726744
gidlparser: Do not set nullable to void type
gstreamer-0.10: Set GstURIHandler.get_uri_type vfunc to get_type

Fixes bug 726745
tests: Use sed '$d' because head -n -1 is not portable

Fixes bug 726908
Release 0.24.0
Hide internal methods in ABI

Fixes bug 700157
gtk+-3.0: Update to 3.12.0
geocode-glib-1.0: Update to 3.12.0
clutter-1.0: Update to 1.18.0
Bump version suffix