buildworld broken in libthr

Hi,

Buildworld broken in libthr:

In file included from /usr/src/lib/libthr/thread/thr_sem.c:34:
/usr/obj/usr/src/i386/usr/include/semaphore.h:57: warning:
`struct timespec' declared inside parameter list

/usr/obj/usr/src/i386/usr/include/semaphore.h:57: warning: its
scope is only this definition or declaration, which is probably
not what you want
*** Error code 1

Stop in /usr/src/lib/libthr.

-Kirill