build,src: enable intl for chakracore

* Enabled intl support to get UTF-8/UTF-16 conversion for inspector.
  This is a temporary move before actual intl support is enabled.
* Removed workaround for UTF-8 conversion functions that weren't
  available before ICU was enabled.

PR-URL: #247
Reviewed-By: Hitesh Kanwathirtha <hiteshk@microsoft.com>
Reviewed-By: Kunal Pathak <Kunal.Pathak@microsoft.com>

configure

@@ -1315,7 +1315,6 @@ def configure_engine(o):
   o['variables']['node_engine'] = engine
   if engine != 'v8':
     o['variables']['node_use_bundled_v8'] = b(False)
-    o['variables']['v8_enable_i18n_support'] = 0
 
 output = {
   'variables': {},