Merge remote-tracking branch 'remotes/kraxel/tags/pull-ui-20160202-1' into staging

ui: gtk vc fix, adaptive sdl refresh.

# gpg: Signature made Tue 02 Feb 2016 13:06:07 GMT 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-ui-20160202-1:
  sdl: shorten the GUI refresh interval when mouse or keyboard is active
  gtk: use qemu_chr_alloc() to allocate CharDriverState

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