[Mono-osx] CFSampleBuffer Additions

[Miguel de Icaza]

Hello!

> I have made fixes requested by Geoff on IRC. I have also mapped a few
> more functions to accomplish what I need. Code compiles but is
> otherwise untested (I have no way to test until it is in MonoTouch
> since the iPod library functions only work on the device.)

Got the code added, it is now available on MonoMac as well, in case
anyone wants to test.

Miguel