Put public domain MD2 implementation in libc/hash/md2.

Use An in AUTHORS section.

Remove self reference in SEE ALSO
Add references consistent with those in md4(3) and md5(3)

Reported by kamil

branches: 1.1.84; 1.1.86;
Put public domain MD2 implementation in libc/hash/md2.

move MD2Transform first.

Catch up with all the lint warnings since exit on warning was disabled.
Disable 'missing header declaration' and 'nested extern' warnings for now.

Update old-style definitions to ANSI, remove a couple of register
definitions along the way. Fixed gcc 4.1 build (thank you vax)

Use C89 definition.
u_int*_t -> uint*_t

branches: 1.5.4; 1.5.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.4.18;
since we rename and provide a weak symbol for MD2Transform make it non-static.

WARNS=4

Fix weak aliasing after recent changes.

Inspired by comments from christos@, xtraeme@, mlelstv@, mhitch@, mrg@,
and uwe@; all the bugs are mine.

Put public domain MD2 implementation in libc/hash/md2.

branches: 1.4.10;
Fix replicated typo

Rename "hash.c" to "hashhl.c" since this is included from *hl.c files.
The name "hash.c" is already used in db/hash/hash.c, and having duplicated
names, aside from it being bad style, breaks the tools/nbcompat build
because it picks the wrong hash.c file. Thanks to greg for helping debug
this.

The weak alias macros can only work before namespace.h gets included because
when the strings get expanded we gain an _ from namespace.h. So define a
macro to point to the appropriate include file for the hash function, and
include the hash function later, from the .c file we always include. This
allows us to eliminate the hack of including namespace.h twice as well as
nbtool_config.h.

Put public domain MD2 implementation in libc/hash/md2.