message: Fix zlib issue on iOS
diff: #define USE_ZLIB 1
  -#ifdef __APPLE__
  -# include "TargetConditionals.h"
  -# if (defined TARGET_OS_IPHONE && TARGET_OS_IPHONE) || (defined TARGET_IPHONE_SIMULATOR && TARGET_IPHONE_SIMULATOR)
  -# undef USE_ZLIB
  -# define USE_ZLIB 0
  - typedef void* gzFile;
  -# endif
  -#endif
  -
  #if USE_ZLIB
  # ifndef _LFS64_LARGEFILE
  # define _LFS64_LARGEFILE 0
  