[gtk] (5 commits) Non-fast-forward update to branch wip/master.win.egl

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

The branch 'wip/master.win.egl' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  6eeef2b... build: Check for EGL support in libepoxy on Windows
  f9b7882... Add a EGL renderer (via ANGLE) for Windows
  3357fae... demos: Fix glarea demo on OpenGL/ES
  f159c97... gdk/win32/gdkglcontext-win32.c: Fix think'o

Commits added to the branch:

  25e4174... gtk-demo: Fix incorrect use of g_strdup_printf (*)
  3d1a9c7... Merge branch 'unsafe-strdup-printf' into 'master' (*)
  0ec46e7... build: Check for EGL support in libepoxy on Windows
  d004f15... Add a EGL renderer (via ANGLE) for Windows
  90117f4... demos: Fix glarea demo on OpenGL/ES

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