security update for arpwatch (CVE-2012-2653)

Changes in arpwatch:

- arpwatch-2.1a11-drop-privs.dif: call initgroups() with pw->pw_gid,
not NULL, to not have groupid 0 initialized. (bnc#764521, CVE-2012-2653)

Fixed bugs
bnc#764521
CVE-2012-2653: arpwatch: improper dropping of privileges
Selected Binaries
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