[libmicrohttpd] Consider adding "are there active/suspended connections" information

[Milan Straka]

Hi all,

I would need to know whether any connections are handled by MHD_Daemon,
after calling the MHD_quiesce_daemon.

The information is readily available inside MHD_Daemon using the
connections_head (and possibly suspended_connections_head).

Would you consider allowing access to this information, for example using
MHD_get_daemon_info? Either as 0/1 information with
MHD_DAEMON_INFO_ANY_ACTIVE_CONNECTIONS (and possibly also with
MHD_DAEMON_INFO_ANY_SUSPENDED_CONNECTIONS), or return the number
of active connections with MHD_DAEMON_INFO_ACTIVE_CONNECTIONS
(and possibly the suspended with MHD_DAEMON_INFO_SUSPENDED_CONNECTIONS)?

Cheers,
Milan Straka