[Freedreno] XA merged, new prebuilts

[Rob Clark]

just quick fyi, XA support is merged in mesa and xf86-video-freedreno.
 Plus a few more compiler fixes in mesa (fixes a few bugs in glmark2,
plus getting *closer* to having working gl2 backend in xonotic).

So if you are building from git, update/rebase mesa and
xf86-video-freedreno.  Or for prebuilt:

http://people.freedesktop.org/~robclark/f20/20140216/prebuilt-freedreno-f20.tgz

(remember, if system update overwrites mesa, just re-extract latest
prebuilt on top)

BR,
-R