Make it possible to delete all certificates from an SSL structure.

ssl/ssl.h

diff --git a/ssl/ssl.h b/ssl/ssl.h
index 17bdc5a..c782868 100644
--- a/ssl/ssl.h
+++ b/ssl/ssl.h
@@ -1922,6 +1922,7 @@
 char *SSL_get_srp_userinfo(SSL *s);
 #endif
 
+void	SSL_certs_clear(SSL *s);
 void	SSL_free(SSL *ssl);
 int 	SSL_accept(SSL *ssl);
 int 	SSL_connect(SSL *ssl);