[yegorich]

This updates the src/ssl submodule from b385396 to 65edff2, the merge of zhaojh329/ssl#9:

• OpenSSL 4.0: SSL_set1_dnsname()/SSL_set1_ipaddr() replace the deprecated SSL_set1_host().
  Before, libuhttpd failed to build against OpenSSL 4.0, because it builds with -Werror by default:

  src/ssl/openssl.c:321:5: error: 'SSL_set1_host' is deprecated: Since OpenSSL 4.0 [-Werror=deprecated-declarations]
  

• CMake: an OpenSSL found by pkg-config is now used with its own include and library directories.
  Before, an OpenSSL outside the default paths was found (Found openssl, version 4.0.3), but
  libuhttpd.so was built against the system OpenSSL and linked libssl.so.3.

The SSL_set1_host() call is only used on the client side, but openssl.c is always compiled, so the
build failure affects libuhttpd too. The server code is unchanged.

Testing

Built on Ubuntu 22.04 (gcc 11) on top of current master (42a7a75), without warnings, against:

• OpenSSL 4.0.3 (via PKG_CONFIG_PATH; libuhttpd.so links libssl.so.4);
• the system OpenSSL 3.0.2;
• wolfSSL 5.2.0;
• Mbed TLS 2.28.0, 3.6.7 and 4.1.1;
• -DSSL_SUPPORT=OFF.

With OpenSSL 4.0.3 and 3.0.2, I ran example/simple_server -s with EC and RSA certificates, using TLS
1.2 and 1.3. In all 8 combinations, these work:

• keep-alive with two requests on one connection;
• a 3 MB download (checksum compared);
• POST to /echo;
• closing the connection after a Connection: close request.

A quick run with wolfSSL and Mbed TLS 4.1.1 (GET, download, and closing after an HTTP/1.0 request, with
TLS 1.2 and 1.3) also passes.

rtty gets the same submodule update in zhaojh329/rtty#167.