Delete unused 'fd' argument from internal function oldttyname()

OK tedu@

of some undefined value.
OK tedu@

review by millert, binary checking process with doug, concept with guenther

ok deraadt naddy

better to find one instead of continuing to mangle this mess.

only doing what's needed for crypt_hashpass. sigh.

ok miod

while changing things, add a crypt_checkpass wrapper that handles most of
the edge cases. (not quite ready for production, though.)
ok deraadt

Kill old files that are no longer compiled.
okay theo

we match API's against each other, fun eh; millert ok

mail floppy parts a fair bit smaller.

things in crypt.3, and create MLINKS

Make sure everything uses {SYS,}LIBC_SCCS properly

Remove unused variables
Install all man-page links

& copied into two pieces so that use of crypt() pulls in a crypt.o
that contains only that one programmer interface -- this permits USA
export of binaries that use crypt() for authentication purposes.
morecrypt.c contains the other DES programmer interfaces commonly
used.