Huge cleanup of the rarpd(8) code :

- Use getifaddrs() instead of rolling our own buggy one.  Previously,
  rarpd(8) would fail to see some interfaces because of a hardcoded limit.
  It now successfully sees any interface in the system, and this also makes
  the code _much_ simpler.
- Replace strncpy() calls with strlcpy() calls.  Some uses of strncpy()
  were bogus ; the code wasn't ensuring that the string was NUL terminated.
- Don't try to guard about select() FD_* macros being undefined.
- Use IF_NAMESIZE and ETHER_ADDR_LEN macros where appropriate.
- Add static keywords to function definitions for consistency, since
  the prototypes have it (I wonder why GCC didn't complain about this).
- Remove compat code for very old BSD versions and SunOS.
- Remove code for systems not having the dirent.h header.
- The code is now WARNS=5 clean so mark it as such.
- Don't add -DTFTP_DIR="/tftpboot" to the build command line since it's
  the default.

MFC after:	2 weeks

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