Copy this port to replace x11/xf86-video-intel,
do not install from wip.

Implemented changes discussed in pkg/50090
(x11/xf86-video-intel fix build and enable functionality
 on newer DragonFly and FreeBSD)

Also includes fixes not quite added discussed in pkg/51687
(x11/xf86-video-intel fix build post xserver 1.19)

Needs to switch to latest git snapshot from freedesktop.org
since no release since 2014.
