wireshark: security bump to version 2.2.12

wireshark: security bump to version 2.2.12

Fixes the following security issues:

CVE-2017-17997: MRDISC dissector crash
https://www.wireshark.org/security/wnpa-sec-2018-02.html

CVE-2018-5334: IxVeriWave file parser crash
https://www.wireshark.org/security/wnpa-sec-2018-03.html

CVE-2018-5335: WCP dissector crash
https://www.wireshark.org/security/wnpa-sec-2018-04.html

CVE-2018-5336: Multiple dissectors could crash
https://www.wireshark.org/security/wnpa-sec-2018-01.html

For more information, see the release notes:
https://www.wireshark.org/docs/relnotes/wireshark-2.2.12.html

While we are at it, also add as hash for license file.

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