Skip wxLocale wxLANGUAGE_DEFAULT test in ANSI builds

The test fails there, but we don't really care about it, Unicode is
required for any level of acceptable locale support anyhow.

tests/intl/intltest.cpp

@@ -226,6 +226,10 @@ void IntlTestCase::IsAvailable()
     CPPUNIT_ASSERT_EQUAL( origLocale, setlocale(LC_ALL, NULL) );
 }
 
+// The test may fail in ANSI builds because of unsupported encoding, but we
+// don't really care about this build anyhow, so just skip it there.
+#if wxUSE_UNICODE
+
 TEST_CASE("wxLocale::Default", "[locale]")
 {
     wxLocale loc;
@@ -233,4 +237,6 @@ TEST_CASE("wxLocale::Default", "[locale]")
     REQUIRE( loc.Init(wxLANGUAGE_DEFAULT, wxLOCALE_DONT_LOAD_DEFAULT) );
 }
 
+#endif // wxUSE_UNICODE
+
 #endif // wxUSE_INTL