Minimize #includes, particularly to avoid thread_private.h

ok tedu@

Eliminate userspace caching by getlogin_r/setlogin; make the getlogin
syscall behave exactly like userspace getlogin_r() and rename it to
match. Eliminate the reduced-to-no-op wrappers of the syscalls.
Eliminate the unnecessary per-thread static buffering by getlogin().

ok kettenis@ deraadt@

Wrap <unistd.h> so that internal calls go direct and they're all weak symbols
Delete unused 'fd' argument from internal function oldttyname()

Use PATH_MAX, NAME_MAX and LOGIN_NAME_MAX not MAXPATHNAMELEN,
MAXNAMLEN or MAXLOGNAME where possible. OK deraadt@

once again: library routines should not check pointers and what errno
with EFAULT. programmers ignore the error returns. please, please,
please -- we want to crash so that the programmer will become aware of
the bug and fix it instead. ok otto

zap remaining rcsid.

Kill old files that are no longer compiled.

okay theo

ansification; checked by pval

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Part one of userland __P removal. Done with a simple regexp with some minor hand editing to make comments line up correctly. Another pass is forthcoming that handles the cases that could not be done automatically.

_THREAD_PRIVATE_MUTEX_UNLOCK() on error before returning; millert@ ok.

_THREAD_PRIVATE_* macros changed

Add thread-safety to libc, so that libc_r will build (on i386 at least).
All POSIX libc api now there (to P1003.1c/D10)
(more md stuff is needed for other libc/arch/*)
(setlogin is no longer a special syscall)
Add -pthread option to gcc (that makes it use -lc_r and -D_POSIX_THREADS).
Doc some re-entrant routines
Add libc_r to intro(3)
dig() uses some libc srcs and an extra -I was needed there.
Add more md stuff to libc_r.
Update includes for the pthreads api
Update libc_r TODO

Clean up some -Wall complaints.

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

branches: 1.1.1;
Initial revision