Slight cleanup in ssl/

SSL_CTX_xxx defines. What was the reason to move them to the top, even before
the copyright and #ifdef HEADER_SSL_H? Hmmm...  when there was and still is a
good reason feel free to reverse this patch, but please document why it is
needed this way.

ssl/ssl_lib.c and ssl/ssl.h. At least the double ctx-variable
confused some compilers.

Submitted by: Lennart Bong <lob@kulthea.stacken.kth.se>
Reviewed by: Ralf S. Engelschall

private keys and/or callback functions which directly correspond to their
SSL_CTX_xxx() counterparts but work on a per-connection basis. This is needed
for applications which have to configure certificates on a per-connection
basis (e.g. Apache+mod_ssl) instead of a per-context basis (e.g.
s_server).

For the RSA certificate situation is makes no difference, but for the DSA
certificate situation this fixes the "no shared cipher" problem where the
OpenSSL cipher selection procedure failed because the temporary keys were not
overtaken from the context and the API provided no way to reconfigure them.

The new functions now let applications reconfigure the stuff and they are in
detail: SSL_need_tmp_RSA, SSL_set_tmp_rsa, SSL_set_tmp_dh,
SSL_set_tmp_rsa_callback and SSL_set_tmp_dh_callback.  Additionally a new
non-public-API function ssl_cert_instantiate() is used as a helper function
and also to reduce code redundancy inside ssl_rsa.c.

Submitted by: Ralf S. Engelschall
Reviewed by: Ben Laurie

     [Eric A. Young, (from changes to C2Net SSLeay, integrated by Mark Cox)]

Fix so that the version number in the master secret, when passed
     via RSA, checks that if TLS was proposed, but we roll back to SSLv3
     (because the server will not accept higher), that the version number
     is 0x03,0x01, not 0x03,0x00
     [Eric A. Young, (from changes to C2Net SSLeay, integrated by Mark Cox)]

Submitted by:
Reviewed by:
PR:

1. Add *lots* of missing prototypes for static ssl functions.
2. VC++ doesn't understand the 'LL' suffix for 64 bits constants: change bn.org
3. Add a few missing prototypes in pem.org
Fix mk1mf.pl so it outputs a Makefile that doesn't choke Win95.
Fix mkdef.pl so it doesn't truncate longer names.

add x509v3.h to mkdef.pl list of include files.

soon - I intend to do a lot of it!).