VirtualBox 2D acceleration

[Sean C. Farley]

Here is a patch that adds 2D acceleration.  I am not sure if the 
VirtualBox_LIBS.freebsd line is needed or not, but it does not cause any 
apparent regressions.  I tested this with the Nvidia driver, and it 
shows improvement within the VM.  I do not know how other drivers will 
work.  EXA may be required over XAA.

If the patch does not make it through the mailing list filter, it can 
also be found here: 
http://people.freebsd.org/~scf/virtualbox-2daccel.patch

Sean
-- 
scf at FreeBSD.org