apr-util: security bump to version 1.6.1
Fixes CVE-2017-12618: Out-of-bounds access in corrupted SDBM database.
Switch to bz2 compressed tarball.
Use upstream provided SHA256 hash.
Add license hash.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>