sdl2: mouse wheel support, ui config notify
# gpg: Signature made Tue 29 Apr 2014 11:17:01 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-sdl-2:
sdl2: Support mouse wheel
sdl2: add ui info setting.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>