Should g_get_host_name() as fallback return "localhost" instead of "unknown"?

[Tor Lillqvist <tml iki fi>]

I notice that a code snippet in Evolution (and there is similar code
also in other places) which could be replaced with a call to
g_get_host_name() uses "localhost" as fallback. Indeed, this is more
logical than "unknown". Anybody object to changing g_get_host_name()?

--tml