Suppress libpng clang warning on GYP

third_party/libpng/libpng.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'libpng',
       'dependencies': [
         '../zlib/zlib.gyp:zlib',
       ],
+      'variables': {
+        # libpng checks that the width is not greater than PNG_SIZE_MAX.
+        # On platforms where size_t is 64-bits, this comparison will always
+        # be false.
+        'clang_warning_flags': [ '-Wno-tautological-constant-out-of-range-compare' ],
+      },
       'sources': [
         'png.c',
         'png.h',
         'pngconf.h',
         'pngerror.c',
         'pngget.c',
         'pnginfo.h',
         'pnglibconf.h',
         'pngmem.c',
         'pngpread.c',
@@ skipping 72 matching lines @@
             ],
           },
         }],
         ['OS=="android"', {
           'toolsets': ['target', 'host'],
         }],
       ],
     },
   ]
 }