DBUS_TYPE_UNIX_FD and DBUS_TYPE_UNIX_FD_AS_STRING are available since
v1.2.16 and v1.5.12 is required now
Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>
they are not compiled of D-Bus is not found nor are the headers
installed if the component is not build thus it is (mostly)
unneccessary compile time overheath to have it
Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>