- Update to 1.22b:
* do not timeout TCP connections (fix #300)
* remove obsolete usage string and added lost version option
* be more defensive when allocating and extending gap

- Update to 1.22:
* sslh-select now supports UDP protocols.
Probes specified in the `protocols`
configuration entry are tried on incoming packets,
TCP or UDP, and forwarded based on the input
protocol (an incoming TCP connection will be
forwarded as TCP, and same with UDP).
This has been tested with DNS as shown in udp.cfg:
incoming packets that contain my domain name are
assumed to be a DNS request and forwarded
accordingly. Note this could cause problems if
combined with incoming TLS with SNI. UDP clients
and servers need to agree on the IPv4/IPv6 they use:
use the same protocol on all sides! Often, this
means explicitely using 'ip4-localhost'.
UDP sender-receiver pairs (connections, so to speak)
are kept for 60s, which can be changed with
`udp_timeout` in the configuration.
* Added probes for UDP protocols QUICK and Teamspeak.
* Added probes for syslog protocol.
* sslh-select refactored to change linear searches
through connections to linear searches through
fd_set.
* Fixed a libconfig call to support libconfig 1.7.3.
* Added symbol to support libconfig 1.4.9, still in