Oops: confstr()'s return value should include the NUL in its count

Problem pointed out by Andres Perera (andres.p (at) zoho.com)

Adds the (somewhat silly) _CS_V[67]_ENV and _CS_POSIX_V[67]_* defines
to <unistd.h> and confstr(3) per POSIX 1003.1-2008

Change confstr(_CS_PATH) to operate directly instead of calling sysctl(3)

po

Adds the (somewhat silly) _CS_V[67]_ENV and _CS_POSIX_V[67]_* defines
to <unistd.h> and confstr(3) per POSIX 1003.1-2008

Change confstr(_CS_PATH) to operate directly instead of calling sysctl(3)

ports build tested by espie@

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confstr() should return 0, not (size_t)-1, on errors; from Guy Harris.
ok millert@ and jmc@ for the man page bit.

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rescinded 22 July 1999.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.

use strlcpy vs strncpy+a[len-1]='\0'. millert@ ok.

Remove dead code
Remove unused variables
Silence some warnings
lint(1) is your friend

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

initial import of NetBSD tree