Make standalone (non-browser) locale detection for windows also accept short locale names

pkg/pkg.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Run this test manually to verify that the fixnum library produces
 # the same results as native ints on a set of directed and random inputs.
 # Skip it when running automated tests because it times out.  This
 # test only makes sense on runtimes that support 64-bit integer
 # arithmetic natively, i.e., the VM.
 fixnum/test/int_64_vm_test: Skip
@@ skipping 19 matching lines @@
 
 [ $runtime == opera && $compiler == dart2js ]
 intl/test/find_default_locale_browser_test: Fail
 intl/test/date_time_format_http_request_test: Skip # Timeout.
 
 # Skip browser-specific Intl tests on VM
 [ $runtime == vm ]
 intl/test/find_default_locale_browser_test: Skip
 intl/test/date_time_format_http_request_test: Skip
 
-[ $runtime == vm && $system == windows ]
-intl/test/find_default_locale_standalone_test: Pass, Fail  # Issue 7722
-
 # Skip http request tests on Dartium while resolving an odd
 # error there that causes the tests to timeout.
 [ $runtime == dartium || $runtime == drt ]
 intl/test/date_time_format_http_request_test: Skip
 
 [ $compiler == dart2js ]
 # Skip intl_message tests that use mirrors on dart2js until it's been
 # implemented there.
 intl/test/intl_message_test: Skip
 intl/test/intl_message_basic_example_test: Skip
 serialization/test/serialization_test: Skip
 
 [ $compiler == dartc ]
 unittest/test/mock_regexp_negative_test: Fail
 unittest/test/mock_stepwise_negative_test: Fail
 
 # pkg/http issue 7458
 http/test/multipart_test: Fail
 
 
 [ $compiler == dart2js ]
 unittest/test/instance_test: Skip
 
 [ $compiler == none && $runtime == drt ]
 dartdoc/test/dartdoc_test: Skip # See dartbug.com/4541.