Make nmap work with INET4-only kernels:

- add new FreeBSD-specific patch;
- remove invalid comment from Makefile (it did build but produced run-time error);
- bump PORTREVISION.

PR:		217558
Approved by:	ohauer (maintainer timeout, 10 weeks), vsevolod (mentor)

security/nmap/Makefile

@@ -3,6 +3,7 @@
 
 PORTNAME=	nmap
 DISTVERSION=	7.40
+PORTREVISION=	1
 CATEGORIES=	security ipv6
 MASTER_SITES=	http://nmap.org/dist/ \
 		LOCAL/ohauer
@@ -24,7 +25,6 @@ LIB_DEPENDS=	libpcre.so:devel/pcre
 USES=		tar:bzip2 gmake cpe
 GNU_CONFIGURE=	yes
 
-# Note: nmap does no longer build agains custom kernel without IPv6!
 OPTIONS_SUB=	yes
 OPTIONS_DEFINE=	DOCS SSL
 OPTIONS_DEFAULT=SSL

security/nmap/files/patch-intf.c

@@ -0,0 +1,11 @@
+--- libdnet-stripped/src/intf.c.orig	2017-03-05 16:19:13.768984000 +0700
++++ libdnet-stripped/src/intf.c	2017-03-05 16:16:48.337379000 +0700
+@@ -163,7 +163,7 @@ intf_open(void)
+ #if defined(SIOCGLIFCONF) || defined(SIOCGIFNETMASK_IN6) || defined(SIOCGIFNETMASK6)
+ 		if ((intf->fd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+ #  ifdef EPROTONOSUPPORT
+-			if (errno != EPROTONOSUPPORT)
++			if (errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT)
+ #  endif
+ 				return (intf_close(intf));
+ 		}