factotum: update prototab (thanks Erik Quanstrom)

R=rsc
http://codereview.appspot.com/3750045

src/cmd/auth/factotum/proto.c

@@ -13,18 +13,22 @@ extern Proto	p9sk2;		/* p9sk2.c */
 extern Proto	p9cr;
 extern Proto	pass;			/* pass.c */
 extern Proto	rsa;			/* rsa.c */
+extern Proto	vnc;			/* p9cr.c */
 
 Proto *prototab[] = {
 	&apop,
+	&chap,
 	&cram,
 	&dsa,
 	&httpdigest,
+	&mschap,
 	&p9any,
 	&p9cr,
 	&p9sk1,
 	&p9sk2,
 	&pass,
 	&rsa,
+	&vnc,
 	nil
 };