This fixes a build issue with old gnutls.
Broken by commit 680d2f49da.
Reported-by: Olga Krishtal <okrishtal@virtuozzo.com>
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Commit d8a8af3492 changed the minimal required version of gnutls
so it's safe to remove the code for older versions.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>