Define HAVE_SSL_get0_verified_chain when it's using libreSSL >= 3.3.6.

Fix the openssl build with older openssl version by disabling the new
ssl_c_r_dn fetch.

This also disable the ssl_client_samples.vtc file for OpenSSL version
older than 1.1.1

This patch introduces the "sigalgs" keyword for the bind line, which
allows to configure the list of server signature algorithms negociated
during the handshake. Also available as "ssl-default-bind-sigalgs" in
the default section.

This patch was originally written by Bruno Henc.

If OPENSSL_NO_DEPRECATED is set, we get a 'error: ‘RSA_PKCS1_PADDING’
undeclared' when building jwt.c. The symbol is not deprecated, we are
just missing an include.

This was raised in GitHub issue #2098.
It does not need to be backported.

This function was introduced in OpenSSL 1.1.0. Prior to that, the
ECDSA_SIG structure was public.
This function was used in commit 5a8f02ae "BUG/MEDIUM: jwt: Properly
process ecdsa signatures (concatenated R and S params)".

This patch needs to be backported up to branch 2.5 alongside commit
5a8f02ae.

This reverts commit d65791e26c12b57723f2feb7eacdbbd99601371b.

Conflict with the patch which was originally written and lacks the
BN_clear_free() and the NULL check.

Commit 5a8f02ae6 ("BUG/MEDIUM: jwt: Properly process ecdsa signatures
(concatenated R and S params)") makes use of ECDSA_SIG_set0() which only
appeared in openssl-1.1.0 and libressl 2.7, and breaks the build before.
Let's just do what it minimally does (only assigns the two fields to the
destination).

This will need to be backported where the commit above is, likely 2.5.

This adds a USE_OPENSSL_WOLFSSL option, wolfSSL must be used with the
OpenSSL compatibility layer. This must be used with USE_OPENSSL=1.

WolfSSL build options:

   ./configure --prefix=/opt/wolfssl --enable-haproxy

HAProxy build options:

  USE_OPENSSL=1 USE_OPENSSL_WOLFSSL=1 WOLFSSL_INC=/opt/wolfssl/include/ WOLFSSL_LIB=/opt/wolfssl/lib/ ADDLIB='-Wl,-rpath=/opt/wolfssl/lib'

Using at least the commit 54466b6 ("Merge pull request #5810 from
Uriah-wolfSSL/haproxy-integration") from WolfSSL. (2022-11-23).

This is still to be improved, reg-tests are not supported yet, and more
tests are to be done.

Signed-off-by: William Lallemand <wlallemand@haproxy.org>

Starting from OpenSSLv3, providers are at the core of cryptography
functions. Depending on the provider used, the way the SSL
functionalities work could change. This new 'show ssl providers' CLI
command allows to show what providers were loaded by the SSL library.
This is required because the provider configuration is exclusively done
in the OpenSSL configuration file (/usr/local/ssl/openssl.cnf for
instance).
A new line is also added to the 'haproxy -vv' output containing the same
information.

The OpenSSL engine API is deprecated starting with OpenSSL 3.0.

In order to have a clean build this feature is now disabled by default.
It can be reactivated with USE_ENGINE=1 on the build line.