xf86-video-cirrus: Changes to 'master'

[Jeremy Huddleston]

Rebased ref, commits from common ancestor:
commit f5a8080f149a2f2658b7773ae7db7c67c52c4199
Author: Stefan Potyra <sistpoty at ubuntu.com>
Date:   Thu Oct 20 14:44:44 2011 -0700

    Limit the maximul pitch of GD5436 and GD5446
    
    Limit the maximum supported pitch of the GD5446 to 4088, since the internal
    pitch register is only 9 bit (and contains the pitch left shifted by 3).
    
    See https://bugs.freedesktop.org/show_bug.cgi?id=23775
    
    Signed-off-by: Jeremy Huddleston <jeremyhu at apple.com>