Unify DES library: ncbc_enc.c wasn't used, but its content was almost
duplicated in cbc_enc.c (without IV updating) and in des_enc.c

As pointed out by others on the openssl-dev list, des

Unify DES library: ncbc_enc.c wasn't used, but its content was almost
duplicated in cbc_enc.c (without IV updating) and in des_enc.c

As pointed out by others on the openssl-dev list, des_cbc_encrypt (without
IV updating; defined in cbc_enc.c) exists only for historical reasons:
des_ncbc_encrypt should be used instead (and the caller does not have
to manually update the IV).

If des_cbc_enrypt is not needed for backwards compatibility, the
definition of des_ncbc_encrypt should be put back into des_enc.c, and
both cbc_enc.c and ncbc_enc.c can be deleted.

If des_cbc_encrypt *is* needed for backwards compatibility, its behaviour
obviously should not change (i.e., don't add IV updating).

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"extern" is a C++ reserved word.

Pointed out by: Janez Jere <jj@void.si>

Remove old libdes version number.

"make update" (added to top Makefile, and applied).

DES CBC change looks dubious to me.

Mention unistd.h.

Some pre-POSIX systems don't have unistd.h (but e.g. lib.c).
Allow configuring the name of that header file.

Oops. Get rid of now incorrect comment.

I keep forgetting to fix this: update the IV! Most important!

Make "make test" fail if bntest fails an internal selfcheck.

The des app.

Survive pedanticism.

crypt(), demos patched.

Call our crypt implementation des_crypt(). crypt() now is a wrapper if
there is no system crypt() available.

Casts.

Warnings and casts.

Don't #define _, and eliminate casts.

Fix to compile the des app.

Prevent name conflicts.

Submitted by: Janez Jere <jj@void.si>

"request" added.

Use mkdir-p.pl more efficiently.

Don't make assumptions on what the path looks like.

Complete support for PKCS#5 v2.0. Still needs extensive testing.

Fix for BIO pairs.

Use locking in a way that makes more sense.