[gtk+] (10 commits) Non-fast-forward update to branch wip/ebassi/gl-context-realize

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'wip/ebassi/gl-context-realize' 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:

  f94ff25... Switch GDK_GL_PROFILE_DEFAULT to mean 3_2_CORE
  4d6aac5... gl: Move getters for context options to the public API
  3d4c55f... gl: Drop OpenGL legacy profile
  ddd86c1... gl: Do not use the extension API for core GL
  f4179b7... glarea: Do not use extension API
  80ee3c4... gl: Add more debugging notes
  c47388e... tests: Update testglarea
  7cd109d... demos: Update the GtkGLArea demo code

Commits added to the branch:

  26390d0... GDK-Win32: Split GL context creation in two phases
  7976c7c... win32/gl: Use the GdkGLContext options
  b59018e... Switch GDK_GL_PROFILE_DEFAULT to mean 3_2_CORE
  92b2a4f... gl: Move getters for context options to the public API
  277d65d... gl: Drop OpenGL legacy profile
  ab4d886... gl: Do not use the extension API for core GL
  3d6617d... glarea: Do not use extension API
  8766bcc... gl: Add more debugging notes
  8f563ba... tests: Update testglarea
  078aae0... demos: Update the GtkGLArea demo code