Support for xorg-server 1.16

Closed Nicolas Chauvet requested to merge github/fork/kwizart/for-upstream into master


This is an attempt to play with libglvnd on fedora 20/21 with RPM Fusion packaged drivers. Currently I cannot replace mesa-libGL on optimus device, probably because fedora mesa is built with tls support enabled This may explain issue like this: (EE) AIGLX error: dlopen of /usr/lib64/dri/ failed (/usr/lib64/dri/ undefined symbol: glapi_tls (EE) AIGLX: reverting to software rendering (EE) GLX: could not load software renderer (II) GLX: no usable GL providers found for screen 0

v2: Test features with ABI_VIDEODRV_VERSION only use XVENDORNAME if defined.

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