sudo: security bump to version 1.8.12

Fixes CVE-2014-9680 - A user with sudo access may be able to exploit
parsing bugs in the time zone parsing functions of the system's C
library functions. The user may also be able to read arbitrary files,
potentially causing changes in system behavior when reading certain
device special files or simply causing the program run via sudo to
block.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>