xf86-video-ati: Changes to 'glamor-si'

[Michel Dänzer]

New branch 'glamor-si' available with the following commits:
commit 6a4fb7ed0b52fdc3d2ea0ff05bf5e76bef76f791
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Thu Jul 5 20:14:48 2012 +0200

    Initial SI support.
    
    Defaults to shadowfb. 3D acceleration is available with glamor. 2D
    acceleration is disabled until the radeonsi driver can handle glamor's
    shaders.
    
    v2: add chip flags (Alex Deucher)
    
    Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

commit 30f3ef29a8c332afd8a36563a2d716df9865456d
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Wed Jun 20 08:40:07 2012 +0200

    Initial glamor support.
    
    Enable at build time with --enable-glamor and runtime with
    
    	Option	"AccelMethod" "glamor"
    
    The most notable lack of functionality is XVideo. Use something like VDPAU for
    now.

commit 71ee7bcbb9decd1a606c1b7227dc5f52d3e006f0
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Wed Jun 27 14:48:47 2012 +0200

    EXA: Factor out pixmap BO allocation into a helper function.