mysql: update to mysql-5.1.68

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xrandr: switch off only HDMI/DFP/CRT outputs on suspend
scripts/image: add support to define official builds

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add PR2637

Signed-off-by: Stephan Raue <stephan@openelec.tv>