faad2: security bump to version 2.8.1

Fixes: CVE-2017-9218, CVE-2017-9219, CVE-2017-9220, CVE-2017-9221,
CVE-2017-9222, CVE-2017-9223, CVE-2017-9253, CVE-2017-9254,
CVE-2017-9255, CVE-2017-9256, CVE-2017-9257

http://seclists.org/fulldisclosure/2017/Jun/32



Switch to .tar.bz2 to save some bandwidth.

Add autoreconf since unfortunately upstream tarball does not ship the
configure script.

Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>