Bug#785122: chocolate-doom: includes licence-incompatible GPLv3 code

[Jonathan Dowland]

Package: chocolate-doom
Version: 2.1.0-1
Severity: serious
Justification: license issue

Chocolate-doom includes code taken from GnuPG, which is GPLv3, whereas
chocolate-doom is GPLv2 (or later). Upstream have fixed this by replacing
the AES implementation with one from the kernel. See

https://github.com/chocolate-doom/chocolate-doom/commit/b3678129fd7bed6c3287ab682819b075e8bf495a

For ref, the first commit introducing this code is

    commit a3b3e15f4eed9aaffc56be69784cd7447cf456de
    Author: Simon Howard <fraggle at gmail.com>
    Date:   Sat Oct 27 06:10:50 2012 +0000

The first released version to include that commit is 2.0.0, meaning
only jessie and onwards are impacted.