[Mesa-dev] DRI3/Present fixes for Mesa 10.3+ (v2)

[Mario Kleiner]

A slightly updated and extended series of the dri3/present fixes for Mesa i
sent last week.

Patch 1 and 2 are same as before. Patch 3 now has signed off by Frank Binns
and reviewed by Chris Wilson. Patch 4 and 5 are additional fixes. The last
one makes INTEL_swap_events behave properly again when swap completion events
come in out of order due to skipped present requests. Before the first out
of sequence sbc event caused the INTEL_swap_events extension to become completely
unuseable for the rest of a session.

thanks,
-mario