- Only #include tcpd.h when LIBWRAP is true to avoid header include errors
- Only define whichaf when LIBWRAP is true to avoid -Wunused warning and
to avoid issues with structs being defined that should only be defined
when tcpd.h is included.
MFC after: 2 weeks
X-MFC with: r312105
Pointyhat to: ngie
Reported by: gcc tinderbox
Sponsored by: Dell EMC Isilon
484b700751