Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
WARNS=3'ify.
Repo copy libpthreads to libkse.This introduces the WITHOUT_LIBKSE nob,and changes WITHOUT_LIBPTHREADS to mean with neither threading libs.Approved by: re(kensmith)
Add function pthread_condattr_setpshared and pthread_condattr_getpshared.