Sets whether @conn uses the system certificate database to verify
peer certificates. This is %TRUE by default. If set to %FALSE, then
peer certificate validation will always set the
%G_TLS_CERTIFICATE_UNKNOWN_CA error (meaning
#GTlsConnection::accept-certificate will always be emitted on
client-side connections, unless that bit is not set in
#GTlsClientConnection:validation-flags).
Sets whether @conn uses the system certificate database to verify peer certificates. This is %TRUE by default. If set to %FALSE, then peer certificate validation will always set the %G_TLS_CERTIFICATE_UNKNOWN_CA error (meaning #GTlsConnection::accept-certificate will always be emitted on client-side connections, unless that bit is not set in #GTlsClientConnection:validation-flags).