[cairo] Not using libpng on OSX

[Travis Griggs]

Attached is a patch, which makes an OS X build not need libpng, but  
instead use the CoreFoundation services provided by OSX. It's a new  
file, and a change to the Makefile.sources (ideally, this second  
should be made conditional). I also go in to my Makefile after  
configure'ing, and whitewash any libpng references and cairo-png.c  
references, so I'm sure it builds/links without them.

The tests all run and don't completely melt down. I think we always  
have a decent amount of failures on OSX to begin with.

I guess the next thing I need to do is figure out how to wire it into  
the Makefile.am stuff. Any help/hints/etc appreciated. If I can figure  
that out, I'll try to submit the more complete patch. But I figured  
I'd post this much, in the event, I'm unable to make much traction  
with this other part. Or in the event it's better done by someone else  
anyway.

BTW, thanks much to numerous IRCers for all the help with this.

--
Travis Griggs
Objologist
For every adage, there is an equal and contrary un-adage

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