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

include/wx/msw/datetimectrl.h

@@ -55,12 +55,14 @@ protected:
     // override these methods anyhow, it does work -- but is definitely ugly
     // and need to be changed (but how?) in the future.
 
+#if wxUSE_INTL
     // Override to return the date/time format used by this control.
     virtual wxLocaleInfo MSWGetFormat() const /* = 0 */
     {
         wxFAIL_MSG( "Unreachable" );
         return wxLOCALE_TIME_FMT;
     }
+#endif // wxUSE_INTL
 
     // Override to indicate whether we can have no date at all.
     virtual bool MSWAllowsNone() const /* = 0 */