GitLab

(XD_BASIC_DBUS_TYPE, xd_symbol_to_dbus_type, xd_signature)
(xd_append_arg, xd_retrieve_arg): Support DBUS_TYPE_UNIX_FD.
(Fdbus_call_method): Add DBUS_TYPE_UNIX_FD type mapping to doc string.
(syms_of_dbusbind): Initialize QCdbus_type_unix_fd).