Merge remote-tracking branch 'remotes/kraxel/tags/pull-gtk-6' into staging

Merge remote-tracking branch 'remotes/kraxel/tags/pull-gtk-6' into staging

gtk: collection of fixes and cleanups by Cole Robinson

# gpg: Signature made Tue 29 Apr 2014 10:44:44 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <[email protected]>"
# gpg:                 aka "Gerd Hoffmann <[email protected]>"
# gpg:                 aka "Gerd Hoffmann (private) <[email protected]>"

* remotes/kraxel/tags/pull-gtk-6:
  gtk: Fix accelerators being triggered twice with gtk3
  gtk: Fix -serial vc
  gtk: Use ctrl+alt+q for quit accelerator
  gtk: Remove use of deprecated stock items
  gtk: Don't use deprecated vte_terminal_get_adjustment
  gtk: Don't use deprecated gtk_image_menu_item_new_with_mnemonic
  configure: Re-run make if gtkabi/sdlabi is changed
  configure: Document --with-gtkabi

Signed-off-by: Peter Maydell <[email protected]>