[Bug 261978] security/dsniff build failure on 12.2S due to pcap_init argument count mismatch

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261978

            Bug ID: 261978
           Summary: security/dsniff build failure on 12.2S due to
                    pcap_init argument count mismatch
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sbz@FreeBSD.org
          Reporter: dewayne@heuristicsystems.com.au
          Assignee: sbz@FreeBSD.org
             Flags: maintainer-feedback?(sbz@FreeBSD.org)

Compilation attempt on 12.2-STABLE FreeBSD 12.2-STABLE #1 r369922M

Using GCC10
In file included from ./dnsspoof.c:28:
./pcaputil.h:14:9: error: conflicting types for 'pcap_init'
   14 | pcap_t *pcap_init(char *intf, char *filter, int snaplen);
      |         ^~~~~~~~~
In file included from /usr/local/include/pcap.h:43,
                 from ./dnsspoof.c:26:
/usr/local/include/pcap/pcap.h:386:14: note: previous declaration of
'pcap_init' was here
  386 | PCAP_API int pcap_init(unsigned int, char *);
      |              ^~~~~~~~~
./dnsspoof.c: In function 'main':
./dnsspoof.c:299:2: warning: 'pcap_lookupdev' is deprecated: use
'pcap_findalldevs' and use the first device [-Wdeprecated-declarations]
  299 |  if (dev == NULL && (dev = pcap_lookupdev(buf)) == NULL)
      |  ^~
In file included from /usr/local/include/pcap.h:43,
                 from ./dnsspoof.c:26:
/usr/local/include/pcap/pcap.h:394:16: note: declared here
  394 | PCAP_API char *pcap_lookupdev(char *)
      |                ^~~~~~~~~~~~~~
*** Error code 1


clang10
/usr/local/include/pcap/funcattrs.h:291:53: note: expanded from macro
'PCAP_DEPRECATED'
  #define PCAP_DEPRECATED(func, msg)    __attribute__((deprecated(msg)))
                                                       ^
./dnsspoof.c:311:37: error: too many arguments to function call, expected 2,
have 3
        if ((pcap_pd = pcap_init(dev, buf, 128)) == NULL)
                       ~~~~~~~~~           ^~~
/usr/local/include/pcap/pcap.h:386:1: note: 'pcap_init' declared here
PCAP_API int    pcap_init(unsigned int, char *);
^
/usr/local/include/pcap/funcattrs.h:147:31: note: expanded from macro
'PCAP_API'
#define PCAP_API        PCAP_API_DEF extern
                                     ^
3 warnings and 2 errors generated.

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