(svn r1594) Convert all undefined parameter lists to (void) and add the appropriate warning flags in the Makefile

subsidy_gui.c

@@ -159,7 +159,7 @@ static const WindowDesc _subsidies_list_desc = {
 };
 
 
-void ShowSubsidiesList()
+void ShowSubsidiesList(void)
 {
 	AllocateWindowDescFront(&_subsidies_list_desc, 0);
 }