[gtkglarea] (24 commits) ...configure.ac: Check correctly for shaders support

[Javier Jardón <jjardon src gnome org>]

Summary of changes:

  a0fc05c... configure.ac: Depends on GTK+3 (*)
  ff98ad9... gtkgl/gdkgl: Port to GTK+3 (*)
  fdb2799... Remove GdkFont related API (*)
  873a642... Remove GdkPixmap related API (*)
  c827f14... Remove deprecated API (*)
  ba6798a... gtkgl/gtkglarea.c: GtkObject doesnt exist anymore (*)
  a33a8de... examples/zktor.c: Replace GDK_<keyname> with GDK_KEY_<keyna (*)
  bb0feae... examples: Do not use gtk_quit_add_destroy() (*)
  346150b... gtkgl/gtkglarea.c: Colormaps doesnt exist anymore (*)
  979eaf1... examples/viewlw.c: Replace the use of gtk_object_* api (*)
  7ea83cd... examples: In GTK+3 "expose_event" is now "draw" signal (*)
  5fbabb2... examples: replace use of deprecated gdk_window_get_pointer( (*)
  07f9046... examples: replace deprecated gtk_vbox_new() function (*)
  169d05a... Change .pc file (*)
  9128464... configure.ac: change libtool version to C+1:0:0 (*)
  b4e9bc2... configure.ac: Set version to 3.0 (*)
  30c64c5... gtkglglarea: Change namespace from gtk_gl_area to ggla_widg (*)
  cc60806... gdkgl: Change namespace from gdk_gl_ to ggla_ (*)
  e7a363c... examples: Port to new name space (*)
  d0c6a7c... docs: Change docs to new namespace (*)
  0b865fa... Change ggla_widget to ggla_area (*)
  3c9dd8d... Port to libepoxy (*)
  370b4cc... examples: port to epoxy (*)
  c0b1966... configure.ac: Check correctly for shaders support (*)

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