Clutter-GTK now works in the same way whether Clutter is running with
the X11 or the GDK backend, including multi-device support.

We don't need flavours any more, given that Clutter and GTK can be
compiled with multiple backend in the same shared library, and that
we need to check at both compile and run-time that the correct backends
are available.

Correctly enable the X11 code paths when Clutter, GDK, and Cairo support
X11, and when the current Clutter backend is X11. For the time being, we
don't support any other combination.

Currently, we only support initialization and embedding a ClutterStage
inside a GtkClutterEmbed. GtkClutterActor will come later.

https://bugzilla.gnome.org/show_bug.cgi?id=658146

The XEvent type/struct is something from the X11 libraries, which is
most probably not available on systems that do not run X11.  Move the
#ifdef HAVE_CLUTTER_GTK_X11 line forward to guard the XEvent line.

The INSTALL file is generated by the autotools.

All the authors are too many to list, and are included in the Git log,
and the ChangeLog generated on dist for tarballs.

The contents of the ChangeLog.SVN are included in the Git log, and the
ChangeLog file is empty and generated on dist.

gtk_clutter_get_stage should not transfer the ownership of the returned stage.

https://bugzilla.gnome.org/show_bug.cgi?id=653934

• Update the automake options to follow the requirements for Gnome
  projects.
• Update the URL for bugs and project page.
• Use AS_HELP_STRING instead of the deprecated AC_HELP_STRING.
• Make sure to unescape the conditional default values in the help
  strings.

This is not supported by GTK+ master, and breaks widget embedding.

https://bugzilla.gnome.org/show_bug.cgi?id=654282

https://bugzilla.gnome.org/show_bug.cgi?id=653435

Explicitly pass the AUTOMAKE envvar to autoreconf, like we do for
ACLOCAL.

The animated-notebook and expose-test were never meant to be used as
real examples.

• Use -no-undefined when building for/on win32.
• Display a critical warning when trying to use GtkClutterActor
  on non-X11 platforms.
• Fix up clutter-win32.h inclusion path.

Based on a patch by: Fridrich Strba <fridrich.strba@bluewin.ch>

http://bugzilla.clutter-project.org/show_bug.cgi?id=2444

This allows having different API versions installed side-by-side

http://bugzilla.clutter-project.org/show_bug.cgi?id=2564

Deprecation guards for dependencies should only be turned on when
building from Git, not from tarballs.