Prefer <fcntl.h> over <sys/fcntl.h> in userlandWhile here, delete some extra #includes and apply style(9) sort rules.ok deraadt@ krw@ mpi@
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.