ARM assembler modules.

Submitted by: Amadeu A. Barbosa Jr <amadeu@tecgraf.puc-rio.br>

[most importantly] put back dependencies accidentaly eliminated in
check-in #13342.

and GNU binutils, but kept BSD make... And I took the opportunity to
unify other targets to this common least denominator...

if $(EXHEADER) is empty.

Notified by many, solution suggested by Carson Gaspar <carson@taltos.org>

"Proper" means "compiles and passes test." Versioning is broken (I think).

COFF and a.out targets [similar to ELF targets]. You might notice some
rudementary support for shared mingw builds under cygwin. It works (it
produces cryptoeay32.dll and ssleay32.dll with everything exported by
name), but it's primarily for testing/debugging purposes, at least for
now...

I also used this opportunity to clean up some out-of-date targets and
re-group targets by OS.

code, Makefile update.

the Makefiles. NB: this commit is probably going to generate a huge posting
and it is highly uninteresting to read.

This is part of a large change submitted by Markus Friedl <markus@openbsd.org>

Submitted by: Tim Rice <tim@multitalents.net>

PR: #735, #765

FreeBSD. Goal is to extend support even to SCO5, UnixWare/OpenUnix...

give it.
For 0.9.7 and up, that means util/domd needs to remove those double
dashes from the argument list when gcc is used to find the
dependencies.

handled properly.
Part of PR 75