wireshark: security bump to version 1.12.7

Fixes:
wnpa-sec-2015-21 - Protocol tree crash.
wnpa-sec-2015-22 - Memory manager crash.
wnpa-sec-2015-23 - Dissector table crash.
wnpa-sec-2015-24 - ZigBee crash.
wnpa-sec-2015-25 - GSM RLC/MAC inifite loop.
wnpa-sec-2015-26 - WaveAgent crash.
wnpa-sec-2015-27 - OpenFlow infinite loop.
wnpa-sec-2015-28 - Ptvcursor crash.
wnpa-sec-2015-29 - WCCP crash.

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