Remove server_get_parameter_nolock

The function is no longer needed as there is no recursive access to the
server.

server/core/server.cc

@@ -942,7 +942,7 @@ static void server_parameter_free(SERVER_PARAM *tofree)
  *
  * @note Should only be called when the server is already locked
  */
-size_t server_get_parameter_nolock(const SERVER *server, const char *name, char* out, size_t size)
+static size_t server_get_parameter_nolock(const SERVER *server, const char *name, char* out, size_t size)
 {
     ss_dassert(SPINLOCK_IS_LOCKED(&server->lock));
     size_t len = 0;