added public wxInfoMessageBox() (slightly modified patch 1828235)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50057 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/utils.h

@@ -87,6 +87,11 @@ WXDLLIMPEXP_CORE void wxBell();
 WXDLLIMPEXP_BASE void wxBell();
 #endif
 
+#if wxUSE_MSGDLG
+// Show wxWidgets information
+WXDLLIMPEXP_CORE void wxInfoMessageBox(wxWindow* parent);
+#endif // wxUSE_MSGDLG
+
 // Get OS description as a user-readable string
 WXDLLIMPEXP_BASE wxString wxGetOsDescription();