try fix builds for other platforms

src/scenedit/scen.menu.cpp

@@ -3,6 +3,7 @@
 #include "scen.menu.hpp"
 #include "scen.menus.hpp"
 #include "scen.graphics.hpp"
+#include "dialogxml/dialogs/dialog.hpp"
 
 #include <stdexcept>
 

src/scenedit/scen.menus.win.cpp

@@ -7,6 +7,7 @@
 #include "winutil.hpp"
 #include "menu_accel.win.hpp"
 #include "undo.hpp"
+#include "dialogxml/dialogs/dialog.hpp"
 
 // Include this last because some #defines in the Windows headers cause compile errors in my headers.
 // Fortunately they're on symbols not used in this file, so this should work.