[cogl/msvc-support] (6 commits) ...Merge branch 'master' into msvc-support

[Chun-wei Fan <fanchunwei src gnome org>]

Summary of changes:

  91f91dc... cogl-renderer.c: Fix includes (*)
  8be44f9... cogl-utils: Include cogl-defines.h (*)
  5369b3c... pipeline: Make the backface culling experimental public (*)
  18b0ad6... test-backface-culling: Use the experimental pipeline API (*)
  39ca3e5... Don't take a reference to the last used onscreen framebuffe (*)
  03e1be4... Merge branch 'master' into msvc-support

(*) This commit already existed in another branch; no separate mail sent