tor-resolve now needs to pull in libor-crypto, openssl, etc etc

When building 0.2.3 or master after the legacy/trac#7352 (moved) merge, my tor-resolve won't build:

  /home/tord/git/src/common/util.c:4017: undefined reference to `memwipe'

The offending line is:

  memwipe(process_handle, 0x0f, sizeof(process_handle_t));

Maybe we'd be happier campers just making that memwipe into a memset?