A GDK backend for clutter was added in commits 610a9c17
(Add A new GDK backend) and f14cbf5b (gdk: Allow disabling event retrieval)
These are not included in the Win32 builds for the moment as GDK3 is
quite unstable on Windows at this time
-Update clutter-version.h.win32.in to reflect the state of
clutter-version.h.in commit 21a24c86 (updated in commit 8249e488)
-Also add clutter_check_windowing_backend to clutter.symbols as a result.
For deprecation of APIs, in commits
522b8be3 (clutter_get_input_device_for_id())
6ef09dd1 (clutter_clear_glyph_cache())
01080dc5 (clutter_[sg]et_font_flags())
