Update to 9.1.7.
Stagify, abuse stage dir and plist to only install files we want to install.
So we don't have to do complex do-install anymore, yay.
For the WITH_GALLIUM option we don't need llvm at run-time.
Obtained from: xorg-dev repo
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The FreeBSD graphics/x11 team proudly presents
a kwm, zeising production:
Mesa 9.1.6, including libGL, libGLU and dri (new xorg only)
Addition of libEGL and libglesv2
KMS support for ATI graphics cards in 10-current (new xorg only)
Improved sparc64 support for new xorg. 
pixman 0.30.2, including shlib bump and portrevision bumps
Make absolute pointing devices work with x11-drivers/xf86-input-mouse
x11-drivers/xf86-video-ati 7.2.0 for 10-current (KMS aware ati driver)
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