update for quassel

- Add fix-CVE-2013-6404.diff: Fix a vulnerability by which an authenticated
malicious user using a custom client, could access the backlog of all users
of a quassel core. This fixes CVE-2013-6404 (bnc#852847).

Fixed bugs
bnc#852847
VUL-0: CVE-2013-6404: quassel: manipulated clients can access backlog of all users on a shared core
Selected Binaries
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