test: fix intl tests on small-icu builds

PR-URL: https://github.com/nodejs/node/pull/41939
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/parallel/test-intl.js

@@ -104,6 +104,12 @@ if (!common.hasIntl) {
     const numberFormat = new Intl.NumberFormat(['en']).format(12345.67890);
     assert.strictEqual(numberFormat, '12,345.679');
   }
+  // If list is specified and doesn't contain 'en-US' then return.
+  if (process.config.variables.icu_locales && !haveLocale('en-US')) {
+    common.printSkipMessage('detailed Intl tests because American English is ' +
+                            'not listed as supported.');
+    return;
+  }
   // Number format resolved options
   {
     const numberFormat = new Intl.NumberFormat('en-US', { style: 'percent' });