Log Message:
Update to gtk2-2.12.4.

Overview of Changes from GTK+ 2.12.3 to 2.12.4
==============================================

 * Bugs fixed:
 494667 gdkpixloader jpeg loader problems with some files
 496546 Tooltips may crashe because a window is destroyed
 503824 gtk_paned_find_neighbours aborts with assertion failure
 388321 gtk_notebook_remove_tab_label
 503190 Doesn't build with directfb >= 1.0
 491847 gtk-builder-convert --root option doesn't work for GtkWin...
 492977 Setup autorelease pool automatically in each mainloop ite...
 499951 GtkAssistant remove_page may leave current_page as a dang...
 502250 Leak in gtkfilechooserdefault.c:shortcuts_reload_icons()
 503569 Leak in GtkTreeViewColumn
 504753 Destroyed subviews are not removed from the view hierarchy
 504804 Typo in TEST_EXPAND_ROW signal
 504984 Problems with hiding/showing transient windows
 505708 compatibility macros for signals has wrong type.
 506107 mem leak in print dialogue
 502850 gtk-builder-convert program not found
 504749 gtk-builder-convert and GtkMenu