Remove mixed-source.patch from zlib.

third_party/zlib/zlib.h

Index: third_party/zlib/zlib.h
diff --git a/third_party/zlib/zlib.h b/third_party/zlib/zlib.h
index 5544c88c2514fc2f548f304a0bec5b9ab8cfe032..36c73af3e3bbdcd88fbfc4b134507eaf20c28abb 100644
--- a/third_party/zlib/zlib.h
+++ b/third_party/zlib/zlib.h
@@ -101,7 +101,6 @@ typedef struct z_stream_s {
     int     data_type;  /* best guess about the data type: binary or text */
     uLong   adler;      /* adler32 value of the uncompressed data */
     uLong   reserved;   /* reserved for future use */
-    int     clas;
 } z_stream;
 
 typedef z_stream FAR *z_streamp;
@@ -208,10 +207,6 @@ typedef gz_header FAR *gz_headerp;
 
 #define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
 
-#define Z_CLASS_STANDARD 0
-#define Z_CLASS_COOKIE 1
-#define Z_CLASS_HUFFMAN_ONLY 2
-
 #define zlib_version zlibVersion()
 /* for compatibility with versions < 1.0.2 */
 
@@ -1749,13 +1744,6 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
      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));
-     ZEXTERN z_off_t ZEXPORT gztell OF((gzFile));
-     ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
-     ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
-     ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
 #  endif
 #else
    ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));