Log Message:
Update to 2.6.4:

Overview of Changes from GTK+ 2.6.3 to GTK+ 2.6.4
=================================================
* Move a lot of const data to the .rodata section [Matthias Clasen]
* Make caching of .icon files work again [Alexander Larsson]
* Fix many translations of our single Q_() message
  to not include the prefix [Christian Persch]

Overview of Changes from GTK+ 2.6.2 to GTK+ 2.6.3
=================================================
* GtkAction
 - Improve the handling of buttons as action
   proxys [Milosz Derezynski]
* gtk_window_present(): Use the timestamp of the last
  user interaction when focusing the window.  [Elijah Newren]
* Icon theme
 - Avoid scaling icons in the file chooser [Vincent Noel]
 - Make icon theme caching work on ppc64 [Manish Singh]
* Win32
 - Bug fixes [Tor Lillqvist]
 - Improve tablet handling [Robert Ögren]
* Other bug fixes [Rodney Dawes, Tommi Komulainen,
  Christian Persch, Manish Singh, Billy Biggs, Ben Maurer,
  Jorn Baayen, Jonathan Blandford, Murray Cumming,
  Olivier Sessink, Matthias, Gustavo Carneiro, Morten
  Welinder, Samuel Hym, Doug Morgan, Ivan Wong, Paul
  Cornett, Sven Neumann, Vincent Untz]
* Documentation improvements [Matthias, Torsten Schoenfeld]
* New and improved translations (ar,be,bg,ca,cy,el,en_GB,fa,gu,ja,hu,pt_BR,th,uk,xh)