Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fixed style of DPADD and LDADD assignments as per style.Makefile(5).

Call crypt() directly instead of taking a detour through makekey.

Remove leaf node WARNS?=2 (that mainly I added). This should
help the GCC3 transition and CURRENT in general.

Silence -Wshadow and -Wmissing-prototypes; set WARNS=2.

Submitted by: Mike Barcroft <mike@q9media.com>

Remove unwanted CFLAGS, and add a CVS id.

MAN[1-9] -> MAN.

Tweaks to allow compiling -Wall (mostly adding "const" to char rcsid[]).

Fix some of the more blatant bugs in the original code, provide a
BSD-able Makefile, add a man page (that also puts a bold warning about
the weakness of the encryption), and implement the -k option for
compatibility with other vendor's implementations. (Unlike those
other vendors, we actually also document this option and its
problems.)

There are more violations of style(9) in it, like the not-use of
getopt(3), but it's not worth the while fixing all of this.

This commit was generated by cvs2svn to compensate for changes in r40767,
which included commits to RCS files with non-trunk default branches.

This is enigma, aka. crypt(1). It has suppsedly been taken from
Cryptbreakers Workbench. While arguably a rather weak encryption,
it's in some use in the Internet still, and provided by a bunch of
other Unix systesms, so we include it here for compatibility.

Silently agreed by: core