Fix mangling of zlib API on 64 bit platforms.

third_party/zlib/zlib.h

 /* zlib.h -- interface of the 'zlib' general purpose compression library
   version 1.2.5, April 19th, 2010
 
   Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
   arising from the use of this software.
 
   Permission is granted to anyone to use this software for any purpose,
@@ skipping 1559 matching lines @@
 #if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
    ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
    ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
    ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
    ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
    ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
 #endif
 
 #if !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
-#  if !defined(MOZZCONF_H)
-#    define gzopen gzopen64
-#    define gzseek gzseek64
-#    define gztell gztell64
-#    define gzoffset gzoffset64
-#    define adler32_combine adler32_combine64
-#    define crc32_combine crc32_combine64
+#  ifdef gzopen
+#    undef gzopen
 #  endif
+#  define gzopen gzopen64
+#  ifdef gzseek
+#    undef gzseek
+#  endif
+#  define gzseek gzseek64
+#  ifdef gztell
+#    undef gztell
+#  endif
+#  define gztell gztell64
+#  ifdef gzoffset
+#    undef gzoffset
+#  endif
+#  define gzoffset gzoffset64
+#  ifdef adler32_combine
+#    undef adler32_combine
+#  endif
+#  define adler32_combine adler32_combine64
+#  ifdef crc32_combine
+#    undef crc32_combine
+#  endif
+#  define crc32_combine crc32_combine64
 #  ifdef _LARGEFILE64_SOURCE
      ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
      ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
      ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
      ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
      ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
      ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
 #  else
      ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
      ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int));
@@ skipping 20 matching lines @@
 ZEXTERN const char   * ZEXPORT zError           OF((int));
 ZEXTERN int            ZEXPORT inflateSyncPoint OF((z_streamp));
 ZEXTERN const uLongf * ZEXPORT get_crc_table    OF((void));
 ZEXTERN int            ZEXPORT inflateUndermine OF((z_streamp, int));
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* ZLIB_H */