NONNULLxxx for several files

src/date.c
src/mdlib.c
src/timeout.c
src/u_init.c
src/vault.c
src/version.c
src/windows.c

src/u_init.c

@@ -13,7 +13,7 @@ struct trobj {
     Bitfield(trbless, 2);
 };
 
-static void ini_inv(struct trobj *);
+static void ini_inv(struct trobj *) NONNULLARG1;
 static void knows_object(int);
 static void knows_class(char);
 static boolean restricted_spell_discipline(int);