Avoid creating TLSProxy on IPv6 loopback address is IPv6 is disabled

Avoid creating TLSProxy on IPv6 loopback address is IPv6 is disabled

Add a parameter to TLSProxy::Proxy->new()
and TLSProxy::Proxy->new_dtls() that indicates IPv6 usage preference
and pass have_IPv6() to it, so IPv6 usage is avoided when it is disabled.

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.foundation>
Reviewed-by: Nikola Pajkovsky <nikolap@openssl.org>
MergeDate: Wed Apr 15 12:45:33 2026
(Merged from https://github.com/openssl/openssl/pull/30580)