Merge remote-tracking branch 'remotes/pmaydell/tags/pull-cocoa-20151016' into staging

cocoa queue:
 * fixes for compiler warnings
 * fix mouse cursor flickering

# gpg: Signature made Fri 16 Oct 2015 11:09:46 BST using RSA key ID 14360CDE
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>"
# gpg:                 aka "Peter Maydell <pmaydell@gmail.com>"
# gpg:                 aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>"

* remotes/pmaydell/tags/pull-cocoa-20151016:
  ui/cocoa.m: blinky mouse cursor fix
  ui/cocoa.m: addRemovableDevicesMenuItems() warning fix
  ui/cocoa.m: eliminate normalWindow warning

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