[CMake] Telling CMake to use zlibConfig.cmake instead of the Findzlib.cmake

[Mathieu Malaterre]

>      are there repositories of CMake projects for common usage libraries 
> such as zlib, jpeg,tiff

I did (the full) JPEG :
http://sourceforge.net/projects/jpeg

I guess you are only looking for the 8bits lossy one, so feel free to 
add option for that. Patch welcome :)

HTH
Mathieu