add sgi_fam as a well-know rpc protocol

okay deraadt@

src/etc/rpc

@@ -1,5 +1,5 @@
 #
-#	$OpenBSD: rpc,v 1.3 2001/11/19 03:03:33 deraadt Exp $
+#	$OpenBSD: rpc,v 1.4 2007/04/26 20:28:38 espie Exp $
 # from: rpc 88/08/01 4.0 RPCSRC; from 1.12   88/02/07 SMI
 #
 portmapper	100000	portmap sunrpc
@@ -34,3 +34,4 @@ nsed		100038
 nsemntd		100039
 pcnfsd		150001	pcnfs
 amd		300019	amq
+sgi_fam		391002	fam	# File alteration monitor