gyp (third_party) warning changes for ccache

gyp/microhttpd.gyp

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'variables': {
     'skia_warnings_as_errors': 0,
   },
   'targets': [{
     'target_name': 'microhttpd',
@@ skipping 13 matching lines @@
         '../third_party/externals/microhttpd/src/microhttpd/daemon.c',
         '../third_party/externals/microhttpd/src/microhttpd/digestauth.c',
         '../third_party/externals/microhttpd/src/microhttpd/internal.c',
         '../third_party/externals/microhttpd/src/microhttpd/md5.c',
         '../third_party/externals/microhttpd/src/microhttpd/memorypool.c',
         '../third_party/externals/microhttpd/src/microhttpd/postprocessor.c',
         '../third_party/externals/microhttpd/src/microhttpd/reason_phrase.c',
         '../third_party/externals/microhttpd/src/microhttpd/response.c',
         '../third_party/externals/microhttpd/src/microhttpd/tsearch.c',
     ],
+    'variables': {
+      'skia_microhttpd_flags' : [
+        '-Wno-sign-compare',
+        '-Wno-unused-const-variable',
+        '-Wno-tautological-constant-out-of-range-compare',
+      ],
+    },
+    'cflags': [ '<@(skia_microhttpd_flags)' ],
+    'xcode_settings': { 'WARNING_CFLAGS': [ '<@(skia_microhttpd_flags)' ], },
     'conditions': [
       # For each platform, run configure and scrape the generated MHD_config.h
       # to get a list of platform specific defines
       # the options to use for configure are:
       # --disable-doc --disable-exapmles --enable-https=no --disable-curl
       # --enable-spdy=no --enable-shared=no
       ['skia_os == "linux"', {
         'cflags': [ '-w' ],
         'libraries': [
             '-lpthread',
@@ skipping 193 matching lines @@
             'PACKAGE_VERSION="0.9.42"',
             "SPDY_SUPPORT=0",
             "STDC_HEADERS=1",
             'VERSION="0.9.42"',
             '_MHD_EXTERN=extern',
         ],
       }],
     ]
   }]
 }