Merge remote-tracking branch 'remotes/kraxel/tags/pull-ui-20160513-1' into staging

gtk/sdl build tweaks
fix gtk 3.20 warnings
gtk clipboard support
spice-gl monitor config support
fix coverity warnings

# gpg: Signature made Fri 13 May 2016 13:30:39 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-ui-20160513-1:
  gtk: don't leak the GtkBorder with VTE 0.36
  gtk: update grab code for gtk 3.20
  spice: fix coverity complains
  egl-helpers: fix possible resource leak
  Changed malloc to g_malloc, free to g_free in ui/shader.c
  spice/gl: add & use qemu_spice_gl_monitor_config
  ui/gtk: copy to clipboard support
  ui: gtk: Fix some deprecation warnings
  ui: gtk: Fix a runtime warning on vte >= 0.37
  configure: support vte-2.91
  configure: report SDL version
  configure: report GTK version
  configure: add echo_version helper
  configure: error on unknown --with-sdlabi value
  configure: build SDL if only SDL2 available
  ui: sdl2: Release grab before opening console window
  ui: gtk: fix crash when terminal inner-border is NULL

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