webos-ports.inc: Allow to build gtk+ with directfb backend for vala->mdbus2
webos-ports.inc: Allow to build gtk+ with directfb backend for vala->mdbus2

Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

Garfonso/meta-webos-ports,Garfonso/meta-webos-ports,nizovn/meta-webos-ports,nizovn/meta-webos-ports