[CFT] drm updates

[Robert Noland]

I've uploaded a final patch set to:

http://people.freebsd.org/~rnoland

I have committed this version to -CURRENT, but patches are available for
RELENG_7 as well.

This version mostly just fixes a long standing memory leak.

All of the reports for radeon have been good.  I'm still seeing a few
odd things with Intel though.  The most severe issue is on my 965gm.
After restarting X, it will hang in a way that I have never seen
before...  The small amount of evidence that I have been able to collect
suggests that this may be due to mesa trashing the hardware.  I've spent
a couple of days trying to figure out exactly what could be wrong.  This
morning I rebuilt my kernel with a stock drm from src and I got exactly
the same hang.  Since this update does help lots of people and doesn't
seem to make things worse than they were to begin with, I went ahead and
committed it.

I was incorrect about the patch to libdrm... It isn't needed in 2.3.1
and it is already committed upstream.  I'll commit that update to ports
soon also.  It, along with a recent xf86-video-* are needed to enable
the new vblank behavior, which will disable vblank interrupts if there
are no active consumers.

robert.
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