Issue 4907 - Update v8 to 5.7.278 in libadblockplus

libadblockplus.gypi

 {
   'includes': ['common.gypi'],
   'conditions': [
     ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
        or OS=="netbsd" or OS=="android"', {
       'target_defaults': {
         'cflags_cc': [ '-Wall', '-W', '-Wno-unused-parameter',
                     '-Wnon-virtual-dtor', '-pedantic' ]
+      }
+    }],
+    ['OS=="linux" and target_arch=="ia32"', {
+      'target_defaults': {
+        'cflags_cc': [ '-m32' ]
       }
     }],
     ['OS=="win"', {
       'target_defaults': {
         'conditions': [
           ['target_arch=="x64"', {
             'msvs_configuration_platform': 'x64'
           }]
         ],
         'msvs_configuration_attributes': {
           'CharacterSet': '1',
         },
         'defines': [
           'WIN32',
         ],
         'link_settings': {
           'libraries': ['-lDbgHelp'],
         },
+      }
+    }],
+    ['OS=="mac" and target_arch=="ia32"', {
+      'xcode_settings': {
+        'ARCHS': ["i386"]
       }
     }],
   ],
 
   'target_defaults': {
     'configurations': {
       'Debug': {
         'defines': [
           'DEBUG'
         ],
@@ skipping 18 matching lines @@
               }, {
                 'RuntimeLibrary': '0',  #/MT
               }
             ]]
           }
         }
       }
     },
   }
 }