[clutter] (18 commits) Created branch multi-backend

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'multi-backend' was created.

Summary of new commits:

  9517075... Add a new GDK backend
  673c810... Rework the interaction between the Cogl and GDK / X11 backe
  d33ffd1... Implement multi-backend support
  5406754... Allow checking the backend type at run-time
  13f92a6... Cosmetic fixes
  b732e16... gdk: Allow disabling event retrieval
  8676666... gdk: Fix Stage foreign window support
  7ee8c67... Remove the X11-specific bit in ClutterStageCogl
  a2258e4... Minimal cosmetic fix to the configure output
  3eef7b0... Coding style and cosmetic fixes
  40e6763... build: Move clutter-event-tslib.c out of egl/
  9ca93eb... build: Move EGL-related files under egl/
  d58edc4... egl: First attempt at cleaning up the EGL native backend
  019c5b9... gdk/events: Clean up the event handling code
  371ae69... build: Improve the compat libs rule
  51ec26e... build: Implement proper platform checking
  8dd2a0d... docs: Update the README section on configure switches
  bee8934... build: Make sure to remove colliding shared libraries