net/tcptrace: fix build after libcap change

The pcap_offline_read() function is no longer exported from the
pcap library, it has become an internal function named
pcapint_offline_read().

The pcap_dispatch() function can be used instead in this particular
case.

Reported by:	pkg-fallout

net/tcptrace/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	tcptrace
 PORTVERSION=	6.6.8
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	net
 #MASTER_SITES=	http://www.tcptrace.org/download/
 

net/tcptrace/files/patch-tcpdump.c

@@ -1,6 +1,16 @@
 --- tcpdump.c.orig	2013-07-01 18:43:14 UTC
 +++ tcpdump.c
-@@ -114,10 +114,13 @@ static int callback(
+@@ -68,9 +68,6 @@ static char const GCC_UNUSED rcsid[] =
+ 
+ 
+ 
+-/* external ref, in case missing in older version */
+-extern int pcap_offline_read(void *, int, pcap_handler, u_char *);
+-
+ /* global pointer, the pcap info header */
+ static pcap_t *pcap;
+ 
+@@ -114,10 +111,13 @@ static int callback(
  	/* for some reason, the windows version of tcpdump is using */
  	/* this.  It looks just like ethernet to me */
        case PCAP_DLT_EN10MB:
@@ -15,3 +25,12 @@
  		case EH_SIZE: /* straight Ethernet encapsulation */
  			memcpy((char *)ip_buf,buf+offset,iplen-offset);
  			callback_plast = ip_buf+iplen-offset-1;
+@@ -250,7 +250,7 @@ pread_tcpdump(
+     int ret;
+ 
+     while (1) {
+-	if ((ret = pcap_offline_read(pcap,1,(pcap_handler)callback,0)) != 1) {
++	if ((ret = pcap_dispatch(pcap,1,(pcap_handler)callback,0)) != 1) {
+ 	    /* prob EOF */
+ 
+ 	    if (ret == -1) {