pthread_join() must not return EINTRSimplify sem_trywait()ok pirofti@ mpi@
kill bad functions; some sort of ok from marc who is trying to confuse me
various cleanups; david says results are same
convert everything to bsd.regress.mk
per man page and gcc 3.0.1, exit requires prototype from stdlib.h
Regression tests for libc_r (pthreads) library.Thanks to pval@ for resolving the license stuff.