- Update to version 3.28.2+20180526.abc7ad8e9:
+ wayland: Don't reset input focus on text commit.
+ frames: Allow for unknown mouse buttons.
+ wayland: update enter/leave output after effects.
+ window-actor: add new signal "effects-completed".
+ wayland: Compare geometries after chaining up.
+ frames: Handle touch events.
+ frames: Make 1st button/motion handlers take generic events.
+ clutter/evdev: Don't ignore CAPS lock as modifier.
+ clutter/evdev: ignore injected events from IM.
+ wayland: Use cursor position in logical monitor.

- Pass --enable-gles2=yes to configure, build gles2 support in
cogl, disabled by default from upstream. We already had the
needed pkgconfig(glesv2) BuildRequires in place.