gnupg: security bump to version 1.4.17

Fixes CVE-2014-4617: The do_uncompress function in g10/compress.c in
GnuPG 1.x before 1.4.17 and 2.x before 2.0.24 allows context-dependent
attackers to cause a denial of service (infinite loop) via malformed
compressed packets, as demonstrated by an a3 01 5b ff byte sequence.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>