gsocks5proxy: Always advertise username/password authentication support
Rather than only advertising it when a username and password have been
provided by the caller. That meant that GSocks5Proxy
would never be
able to return G_IO_ERROR_PROXY_NEED_AUTH
, since the proxy server
would never request username/password authentication, since GLib claimed
to not support it (if a username and password were not already
provided).
Signed-off-by: Philip Withnall withnall@endlessm.com
Fixes: #1988 (closed)