xdriver_xf86-video-fbturbo: new package

Add the fbturbo video driver, which is based on xf86-video-fbdev (with
none of the original features stripped), primarily optimized for the
devices powered by the Allwinner SoC (A10, A13, A20).

https://github.com/ssvb/xf86-video-fbturbo/



Signed-off-by: Scott Fan <fancp2007@gmail.com>
[yann.morin.1998@free.fr: strip help text to the basics only]
[Peter: needs libdrm/pixman, add patch to drop libdri2 dependency
	reformat and add optional libpciaccess support]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>