[build] Use icu data file by default

src/v8.gyp

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 {
   'variables': {
-    'icu_use_data_file_flag%': 0,
     'v8_code': 1,
     'v8_random_seed%': 314159265,
     'v8_vector_stores%': 0,
     'embed_script%': "",
     'warmup_script%': "",
     'v8_extra_library_files%': [],
     'v8_experimental_extra_library_files%': [],
     'mksnapshot_exec': '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)mksnapshot<(EXECUTABLE_SUFFIX)',
   },
   'includes': ['../gypfiles/toolchain.gypi', '../gypfiles/features.gypi'],
@@ skipping 2242 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }