[clutter] (22 commits) Created branch multi-backend

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'multi-backend' was created.

Summary of new commits:

  9db1b53... Add a new GDK backend
  dff7a21... Rework the interaction between the Cogl and GDK / X11 backe
  7902390... Implement multi-backend support
  08b6828... Allow checking the backend type at run-time
  2505170... Cosmetic fixes
  84b3d11... gdk: Allow disabling event retrieval
  e191eea... gdk: Fix Stage foreign window support
  281ad06... Remove the X11-specific bit in ClutterStageCogl
  ff0a2d7... Minimal cosmetic fix to the configure output
  4c322df... Coding style and cosmetic fixes
  c5c149f... build: Move clutter-event-tslib.c out of egl/
  90c1960... build: Move EGL-related files under egl/
  8b80457... egl: First attempt at cleaning up the EGL native backend
  0c80df8... gdk/events: Clean up the event handling code
  8eb7e0d... build: Improve the compat libs rule
  ac545ea... build: Implement proper platform checking
  7e0e33c... docs: Update the README section on configure switches
  1dd9ef8... build: Make sure to remove colliding shared libraries
  d3954b9... Clean up the backend creation
  e71a3be... Clean up the windowing system defines
  ae4a010... interactive/devices: Always build
  ffc0409... interactive/pixmap: Make sure to work only on the X11 backe