[cairo] PS module requires zlib but doesn't check for it

[Jason Dorje Short]

The postscript surface backend requires zlib to be present.  But there's 
no check for this in configure.in.

The attached patch just disables the PS module if zlib or zlib-dev isn't 
present (both library and header files are needed).  There may be a 
better fix however: maybe configure should tell the user why PS isn't 
being built, or maybe if zlib isn't present the PS module can be built 
without zlib (don't know if that's possible).

-jason
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