gyp: clean up warnings with clang-3.8

gyp/lua.gyp

 #
 # Copyright 2013 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 
 {
   'targets': [
     {
@@ skipping 41 matching lines @@
         '../third_party/lua/src/',
       ],
       'all_dependent_settings': {
         'include_dirs': [
           '../third_party/lua/src/',
         ],
       },
       'defines': [
         "getlocaledecpoint()='.'",
       ],
-      'cflags': [
-        '-Wno-parentheses-equality',
-        '-Wno-pointer-bool-conversion',
-       ],
-      'xcode_settings': {
-        'WARNING_CFLAGS': [
+      'variables': {
+        'skia_lua_flags' : [
           '-Wno-parentheses-equality',
           '-Wno-pointer-bool-conversion',
+          '-Wno-array-bounds',
         ],
       },
+      'cflags': [ '<@(skia_lua_flags)' ],
+      'xcode_settings': { 'WARNING_CFLAGS': [ '<@(skia_lua_flags)' ], },
       'conditions': [
         ['skia_os != "win"',
          {
             'defines': [
               'LUA_USE_POSIX',  # Fix warning re dangerous tmpnam.
             ],
           }
         ],
         [ 'skia_clang_build == 1', {
           'cflags':[
             '-w',
           ],
         }],
       ],
     },
   ],
 }