libnss: security bump to version 3.22.2

libnss: security bump to version 3.22.2

Fixes:
CVE-2016-1950 - heap-based buffer overflow related to the parsing of
certain ASN.1 structures. An attacker could create a specially-crafted
certificate which, when parsed by NSS, would cause a crash or execution
of arbitrary code with the permissions of the user.

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