[build] Use icu data file by default

gypfiles/standalone.gypi

Index: gypfiles/standalone.gypi
diff --git a/gypfiles/standalone.gypi b/gypfiles/standalone.gypi
index ccb94182663b3d95246ccc2e134b1a3875fb201b..a2047f1c40cfdd4a1c0c44f1f1652314f1f42028 100644
--- a/gypfiles/standalone.gypi
+++ b/gypfiles/standalone.gypi
@@ -149,6 +149,9 @@
 
       'test_isolation_mode%': 'noop',
 
+      # By default, use ICU data file (icudtl.dat).
+      'icu_use_data_file_flag%': 1,
+
       'conditions': [
         # Set default gomadir.
         ['OS=="win"', {
@@ -197,6 +200,7 @@
     'fastbuild%': '<(fastbuild)',
     'coverage%': '<(coverage)',
     'sysroot%': '<(sysroot)',
+    'icu_use_data_file_flag%': '<(icu_use_data_file_flag)',
 
     # Add a simple extras solely for the purpose of the cctests
     'v8_extra_library_files': ['../test/cctest/test-extra.js'],