[Bug 232828] tools/tools/netmap can not be built

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232828

            Bug ID: 232828
           Summary: tools/tools/netmap can not be built
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: lev at FreeBSD.org

On both 11.2-STABLE and 13-CURRENT "pkt-gen" from tools/tools/netmap can not be
built:

cc  -O2 -pipe -Werror -Wall -Wextra   -g -std=gnu99 -fstack-protector-strong   
-Qunused-arguments -Qunused-arguments  -g -std=gnu99 -fstack-protector-strong  
 -Qunused-arguments -Qunused-arguments  -c
/data/src/tools/tools/netmap/pkt-gen.c -o pkt-gen.o
/data/src/tools/tools/netmap/pkt-gen.c:650:19: error: taking address of packed
member 'ip' of class or structure 'pkt' may result in an unaligned pointer
value [-Werror,-Waddress-of-packed-member]
        struct ip *ip = &pkt->ip;
                         ^~~~~~~
/data/src/tools/tools/netmap/pkt-gen.c:651:24: error: taking address of packed
member 'udp' of class or structure 'pkt' may result in an unaligned pointer
value [-Werror,-Waddress-of-packed-member]
        struct udphdr *udp = &pkt->udp;
                              ^~~~~~~~
/data/src/tools/tools/netmap/pkt-gen.c:745:8: error: taking address of packed
member 'ip' of class or structure 'pkt' may result in an unaligned pointer
value [-Werror,-Waddress-of-packed-member]
        ip = &pkt->ip;
              ^~~~~~~
/data/src/tools/tools/netmap/pkt-gen.c:762:9: error: taking address of packed
member 'udp' of class or structure 'pkt' may result in an unaligned pointer
value [-Werror,-Waddress-of-packed-member]
        udp = &pkt->udp;
               ^~~~~~~~
4 errors generated.
*** Error code 1

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