Add new function SSL_CTX_get_ssl_method().

Partial fix for PR#3183.

ssl/ssl.h

diff --git a/ssl/ssl.h b/ssl/ssl.h
index 3c49a38..da777e9 100644
--- a/ssl/ssl.h
+++ b/ssl/ssl.h
@@ -2357,6 +2357,7 @@
 int SSL_renegotiate_pending(SSL *s);
 int SSL_shutdown(SSL *s);
 
+const SSL_METHOD *SSL_CTX_get_ssl_method(SSL_CTX *ctx);
 const SSL_METHOD *SSL_get_ssl_method(SSL *s);
 int SSL_set_ssl_method(SSL *s, const SSL_METHOD *method);
 const char *SSL_alert_type_string_long(int value);