Lowercase name of SSL_validate_ct as it is an internal function

Reviewed-by: Emilia Käsper <emilia@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>

ssl/ssl_lib.c

@@ -4029,7 +4029,7 @@ ct_validation_cb SSL_CTX_get_ct_validation_callback(const SSL_CTX *ctx)
     return ctx->ct_validation_callback;
 }
 
-int SSL_validate_ct(SSL *s)
+int ssl_validate_ct(SSL *s)
 {
     int ret = 0;
     X509 *cert = SSL_get_peer_certificate(s);