lib/timer.c needs sys/time.h included under FreeBSD ...

[Katsuhiro Kondou]

In article <ylhf26p61e.fsf at windlord.stanford.edu>,
	Russ Allbery <rra at stanford.edu> wrote;

} We really want to switch to something like HDR_PATH or H_PATH or something
} like that (the latter may conflict with include header guards, though).

I've switched to HDR__*, since HDR_* is already used like HDR_LEN(),
and committed.
-- 
Katsuhiro Kondou