Add macOS to the list of OSes that define IPPROTO_IGRP as 88. [skip ci]

Author: guyharris

ipproto.h

@@ -64,7 +64,7 @@ extern const char *netdb_protoname (const uint8_t);
  * "any private interior gateway (used by Cisco for their IGRP)" and
  * 88 as "EIGRP" from Cisco.
  *
- * Recent FreeBSD and DragonFly BSD <netinet/in.h> headers define
+ * Recent FreeBSD, DragonFly BSD, and macOS <netinet/in.h> headers define
  * IP_PROTO_IGRP as 9 and IP_PROTO_IGRP as 88.  We define IP_PROTO_PIGP
  * ("private interior gateway protocol") as 9 and IP_PROTO_EIGRP as 88;
  * those names* better match what the current protocol number

print-ip-demux.c

@@ -127,12 +127,12 @@ ip_demux_print(netdissect_options *ndo,
 		 * (used by Cisco for their IGRP)" and 88 as
 		 * "EIGRP" from Cisco.
 		 *
-		 * Recent FreeBSD and DragonFly BSD <netinet/in.h> headers
-		 * define IP_PROTO_IGRP as 9 and IP_PROTO_IGRP as 88.
-		 * We define IP_PROTO_PIGP ("private interior gateway
-		 * protocol") as 9 and IP_PROTO_EIGRP as 88; those names
-		 * better match what the current protocol number
-		 * assignments say.
+		 * Recent FreeBSD, DragonFly BSD, and macOS <netinet/in.h>
+		 * headers define IP_PROTO_IGRP as 9 and IP_PROTO_IGRP
+		 * as 88.  We define IP_PROTO_PIGP ("private interior
+		 * gateway protocol") as 9 and IP_PROTO_EIGRP as 88;
+		 * those names better match what the current protocol
+		 * number assignments say.
 		 */
 		igrp_print(ndo, bp, length);
 		break;