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/datectrl.h

@@ -54,7 +54,9 @@ public:
     virtual WXDWORD MSWGetStyle(long style, WXDWORD *exstyle) const;
 
 protected:
+#if wxUSE_INTL
     virtual wxLocaleInfo MSWGetFormat() const;
+#endif // wxUSE_INTL
     virtual bool MSWAllowsNone() const { return HasFlag(wxDP_ALLOWNONE); }
     virtual bool MSWOnDateTimeChange(const tagNMDATETIMECHANGE& dtch);