Xv: enable drmmode overlay

Now that libdrm 2.4.16 is released (and already required) we can
unconditionally enable this.

Please add something like this to the release-notes/NEWS file:

* Overlay support for kernel modesetting. This needs at least kernel
  v2.6.33 to work. A backport to 2.6.32 is available at:

  http://gitorious.org/daniel-s-linux-stuff/linux-kernel/commits/intel-kms-overlay-for-2.6.32

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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