Fix wxMSW build when wxUSE_INTL==0.

Don't use wxLocaleInfo in this case as it's not defined.

Closes #15599.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75059 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/datetimectrl.cpp

@@ -110,8 +110,12 @@ wxSize wxDateTimePickerCtrl::DoGetBestSize() const
 {
     wxClientDC dc(const_cast<wxDateTimePickerCtrl *>(this));
 
-    // Use the same native format as this as the underlying native control.
+    // Use the same native format as the underlying native control.
+#if wxUSE_INTL
     wxString s = wxDateTime::Now().Format(wxLocale::GetInfo(MSWGetFormat()));
+#else // !wxUSE_INTL
+    wxString s("XXX-YYY-ZZZZ");
+#endif // wxUSE_INTL/!wxUSE_INTL
 
     // the best size for the control is bigger than just the string
     // representation of the current value because the control must accommodate