Fun fact: these files used to be called log.[ch] until we ran into
conflicts with systems having a log.h file. But now that we always
include "lib/log/log.h", we should be fine.
These are now combined into an inaddr.[ch], since their purpose is
to implement functions for struct in_addr and struct in6_addr.
The definitions for in6_addr and its allies are now in a separate
header, inaddr_st.h.
Closes ticket 26532.
