Allow creating wxUILocale objects for any locale

Creating such objects (without using them for the UI) is supported under
all platforms, so allow doing it.

Note that this is only supported under Unix systems when locale_t and
related functionality is available, but this should be the case just
about everywhere by now.

Add a test (or, rather, replace an existing test which was disabled by
default) checking that we can now get locale information about any
locale, not necessarily the currently used one.

src/msw/uilocale.cpp

@@ -142,7 +142,7 @@ wxString wxLocaleIdent::GetName() const
 // LCID-based wxUILocale implementation for MSW
 // ----------------------------------------------------------------------------
 
-// TODO-XP: Drop it when we don't support XP any longer.
+// TODO-XP: Replace with wxUILocaleImplName when we don't support XP any longer.
 class wxUILocaleImplLCID : public wxUILocaleImpl
 {
 public:
@@ -367,6 +367,21 @@ wxUILocaleImpl* wxUILocaleImpl::CreateForLanguage(const wxLanguageInfo& info)
     return new wxUILocaleImplLCID(info.GetLCID());
 }
 
+/* static */
+wxUILocaleImpl* wxUILocaleImpl::CreateForLocale(const wxLocaleIdent& locId)
+{
+    if ( !wxUILocaleImplName::CanUse() )
+    {
+        // We could try finding the LCID matching the name, but support for XP
+        // will be dropped soon, so it just doesn't seem worth to do it (note
+        // that LocaleNameToLCID() itself is not available in XP neither, so we
+        // can't just use it here).
+        return NULL;
+    }
+
+    return new wxUILocaleImplName(locId.GetName());
+}
+
 /* static */
 int
 wxUILocale::CompareStrings(const wxString& lhs,