Update from https://crrev.com/303153

third_party/zlib/zutil.h

 /* zutil.h -- internal interface and configuration of the compression library
  * Copyright (C) 1995-2010 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
 /* WARNING: this file should *not* be used by applications. It is
    part of the implementation of the compression library and is
    subject to change. Applications should only use zlib.h.
  */
 
@@ skipping 124 matching lines @@
 #    ifndef fdopen
 #      define fdopen(fd,mode) NULL /* No fdopen() */
 #    endif
 #  endif
 #endif
 
 #ifdef TOPS20
 #  define OS_CODE  0x0a
 #endif
 
+#ifdef _MSC_VER
+#define zalign(x) __declspec(align(x))
+#else
+#define zalign(x) __attribute__((aligned((x))))
+#endif
+
 #ifdef WIN32
 #  ifndef __CYGWIN__  /* Cygwin is Unix, not Win32 */
 #    define OS_CODE  0x0b
 #  endif
 #endif
 
 #ifdef __50SERIES /* Prime/PRIMOS */
 #  define OS_CODE  0x0f
 #endif
 
@@ skipping 125 matching lines @@
 voidpf ZLIB_INTERNAL zcalloc OF((voidpf opaque, unsigned items,
                         unsigned size));
 void ZLIB_INTERNAL zcfree  OF((voidpf opaque, voidpf ptr));
 
 #define ZALLOC(strm, items, size) \
            (*((strm)->zalloc))((strm)->opaque, (items), (size))
 #define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
 #define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
 
 #endif /* ZUTIL_H */