buildroot

audiofile: add security patch for CVE-2017-6839

Integer overflow in modules/MSADPCM.cpp in Audio File Library (aka
audiofile) 0.3.6 allows remote attackers to cause a denial of service
(crash) via a crafted file.

https://blogs.gentoo.org/ago/2017/02/20/audiofile-multiple-ubsan-crashes/
https://github.com/mpruett/audiofile/issues/41

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>