[clutter/msvc-support] (7 commits) ...Merge branch 'master' into msvc-support

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

Summary of changes:

  dd02c56... build: Adds missing clutter-egl-headers.h (*)
  b3c93bc... build: Adds missing clutter-glx.h (*)
  6a73cec... backend-cogl: fix s/egl/cogl/ naming left-over (*)
  fa8e6d3... Do not include clutter-egl.h unconditionally (*)
  dd6392b... Update the location of the cex100 header in the ignore file (*)
  d90c849... make some parts of the stage-window interface optional (*)
  0c31bcb... Merge branch 'master' into msvc-support

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