Merge remote-tracking branch 'remotes/kraxel/tags/pull-gtk-20150508-1' into staging

gtk: add ui_info support, cleanups + fixes.

# gpg: Signature made Fri May  8 12:47:04 2015 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-gtk-20150508-1:
  gtk: update mouse position in mouse_set()
  gtk: create gtk.h
  gtk: add ui_info support
  console: add dpy_ui_info_supported
  console: delayed ui_info guest notification

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>