ZLIB version:   1.2.3
LIBPNG version: 1.2.8

Make sure to define ZLIB_WINAPI before including zlib.h!

The ZLIB_WINAPI macro will switch on the WINAPI (STDCALL)
with which the library files were compiled

NOTE: If you make a native Win64 compilation use the libraries and header files
      from the win64/ directory. Some changes had to be made to compile the
      libraries (provided by michi_cc)
