KSSL: fixed detection of correct 'SSL_get_peer_certificate' method. This resolves incompatibility with openSSL 3.0.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 682b8acae4)

tdeio/kssl/kopenssl.cpp

@@ -635,7 +635,8 @@ TDEConfig *cfg;
       K_SSLv3_client_method = (SSL_METHOD *(*)()) GET_SSLLIB_SYMBOL("SSLv3_client_method");
       K_TLS_client_method = (SSL_METHOD *(*)()) GET_SSLLIB_SYMBOL("TLS_client_method");
       if (!K_TLS_client_method) K_TLS_client_method = (SSL_METHOD *(*)()) GET_SSLLIB_SYMBOL("SSLv23_client_method");
-      K_SSL_get_peer_certificate = (X509 *(*)(SSL *)) GET_SSLLIB_SYMBOL("SSL_get_peer_certificate");
+      K_SSL_get_peer_certificate = (X509 *(*)(SSL *)) GET_SSLLIB_SYMBOL("SSL_get1_peer_certificate");
+			if (!K_SSL_get_peer_certificate) K_SSL_get_peer_certificate = (X509 *(*)(SSL *)) GET_SSLLIB_SYMBOL("SSL_get_peer_certificate");
       K_SSL_CIPHER_get_bits = (int (*)(SSL_CIPHER *,int *)) GET_SSLLIB_SYMBOL("SSL_CIPHER_get_bits");
       K_SSL_CIPHER_get_version = (char * (*)(SSL_CIPHER *)) GET_SSLLIB_SYMBOL("SSL_CIPHER_get_version");
       K_SSL_CIPHER_get_name = (const char * (*)(SSL_CIPHER *)) GET_SSLLIB_SYMBOL("SSL_CIPHER_get_name");