Some services are still provided using TLS 1.0 and older ciphers.
It is possible to use the nc command to connect to these services
using the "-T tlsall" option, but that also enables legacy and
insecure ciphers and is not desirable.
Instead add a new "-T tlscompat" option that can be used to access
older servers while not also enabling insecure and very old legacy
ciphers possibly allowing them to be unintentionally used (perhaps
because of a server misconfiguration).