[core] Fix compilation on non-linux systems

src/main/plugin_core.c

@@ -968,6 +968,7 @@ static gboolean core_workers_cpu_affinity(liServer *srv, liPlugin* p, liValue *v
 
 	return TRUE;
 #else
+	UNUSED(p); UNUSED(val); UNUSED(userdata);
 	ERROR(srv, "%s", "workers.cpu_affinity is only available on Linux systems");
 	return FALSE;
 #endif

src/main/server.c

@@ -279,7 +279,9 @@ void li_server_free(liServer* srv) {
 	g_array_free(srv->li_plugins_handle_close, TRUE);
 	g_array_free(srv->li_plugins_handle_vrclose, TRUE);
 
+#ifdef LIGHTY_OS_LINUX
 	li_value_free(srv->workers_cpu_affinity);
+#endif
 
 	if (srv->started_str)
 		g_string_free(srv->started_str, TRUE);