make including config.h always depend on HAVE_CONFIG_H; replace printf() by debug()

server/menu.c

@@ -29,7 +29,9 @@
 #include <unistd.h>
 #include <assert.h>
 
-#include "config.h"
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
 
 #include "menuitem.h"
 #include "menu.h"