Engage run-time switch between bn_mul_mont_fpu and bn_mul_mont_int.

[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...

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>

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

errors can be tolerated, hide the error from 'make'.
This gives shorter output both if ranlib fails and if
it works.

sure they are available in opensslconf.h, by giving them names starting
with "OPENSSL_" to avoid conflicts with other packages and by making
sure e_os2.h will cover all platform-specific cases together with
opensslconf.h.

I've checked fairly well that nothing breaks with this (apart from
external software that will adapt if they have used something like
NO_KRB5), but I can't guarantee it completely, so a review of this
change would be a good thing.

acceptable, since all that happens if it fails is a library with
an index, which makes linking slower, but still working correctly.

proposed by Holger Reif

./config sences whole range of SPARC instruction sets. Do note that
it favors Sun C now if both gcc and cc 4.2 or later are present!