Clean up zlib CMakeLists.txt. Suppress deprecation warnings on windows.
Clean up zlib CMakeLists.txt. Suppress deprecation warnings on windows.

petertsoi/libmv,SoylentGraham/libmv,Nazg-Gul/libmv,rgkoo/libmv-blender,rgkoo/libmv-blender,keir/libmv,rgkoo/libmv-blender,libmv/libmv,rgkoo/libmv-blender,keir/libmv,libmv/libmv,Nazg-Gul/libmv,Nazg-Gul/libmv,petertsoi/libmv,Nazg-Gul/libmv,SoylentGraham/libmv,SoylentGraham/libmv,keir/libmv,SoylentGraham/libmv,petertsoi/libmv,libmv/libmv,keir/libmv,petertsoi/libmv,rgkoo/libmv-blender,libmv/libmv,Nazg-Gul/libmv