Commits on Jan 14, 2022

1. Fix build on FreeBSD …

   The include directive of `netinet/in.h` must be before `resolv.h` on FreeBSD, otherwise, the following errors will occur:
   
   ```
   In file included from dns.c:265:
   /usr/include/resolv.h:159:14: error: array has incomplete element type 'struct sockaddr_in'
                   nsaddr_list[MAXNS];     /*%< address of name server */
                              ^
   /usr/include/resolv.h:158:9: note: forward declaration of 'struct sockaddr_in'
           struct sockaddr_in
                  ^
   /usr/include/resolv.h:173:18: error: field has incomplete type 'struct in_addr'
                   struct in_addr  addr;
                                   ^
   /usr/include/resolv.h:173:10: note: forward declaration of 'struct in_addr'
                   struct in_addr  addr;
                          ^
   /usr/include/resolv.h:198:21: error: field has incomplete type 'struct sockaddr_in'
           struct sockaddr_in      sin;
                                   ^
   /usr/include/resolv.h:158:9: note: forward declaration of 'struct sockaddr_in'
           struct sockaddr_in
                  ^
   3 errors generated.
   ```
   
   The reason is that the `resolv.h` on FreeBSD is not yet self-contained, see this bug report: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=182466
   
   This fix was committed with the FreeBSD port `net/R-cran-pingr` in https://cgit.freebsd.org/ports/commit/?id=fce80f530301d0079d84bc4b818ba957ad29617b.

   

   yzgyyang committed Jan 14, 2022
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