src: fix without-intl build

In 5d38d54, an additional property in node_config.cc was added
whose definition depends on having the local `env` variable declared,
which in turn depended on `NODE_HAVE_I18N_SUPPORT` being defined.

Moving `env = ...` out of the `#ifdef` block allows building via
`./configure --without-intl` again.

PR-URL: #6820
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

src/node_config.cc

@@ -29,8 +29,8 @@ using v8::Value;
 void InitConfig(Local<Object> target,
                 Local<Value> unused,
                 Local<Context> context) {
-#ifdef NODE_HAVE_I18N_SUPPORT
   Environment* env = Environment::GetCurrent(context);
+#ifdef NODE_HAVE_I18N_SUPPORT
 
   READONLY_BOOLEAN_PROPERTY("hasIntl");