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Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

See https://github.com/randombit/botan/issues/761

If available in Botan.

There is an issue where, if botan supports it but we don’t enable it, then
the TLS handshake may fail with some servers

This way, TCPSocketHandler only deal with the message sending/receiving, not
the connect() or anything else.  This will be used for implementing servers
(because when a client is accepted, we don’t need all the connect() and dns
resolution stuff).

fix #3171

The version with the vector, that can be disabled etc, is “very” slow, so we
use unique_ptr when we don’t need to disable it, and when it only contains
one function

fix coverity CID 134470

For the getaddrinfo call we added in the previous commit, to convert the IP
provided in the conf.

The error should not tell “while reading” when we are just connecting.

Lets the admin choose a local address to bind each outgoing (IRC) socket.

When trying the various results of getaddrinfo, we forgot to close the
socket when one fails, before trying the next one.

Also use the destructor to make sure we do not have some other unrelated
leak.

fix #3137

fix #3083

Because this is a nightmare to manage