[cairo] Updates for DirectFB backend

[Claudio Ciccani]

Hi,

Attached is a big patch againt the DirectFB backend with important fixes
and improvements (and some cleanup).
I used to push my changes to the DirectFB repository but, since the
backend got stable enough, there is no more a valid reason to keep two
different versions.
If possible, I'd like a Git account with write access (I already own an
account at freedesktop for Mesa).
Thanks.

----
Regards,
     Claudio Ciccani

klan at users.sf.net
http://directfb.org
http://sf.net/projects/php-directfb
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