libxml2: fixed hash table collisions CPU usage DoS

This update of libxml2 fixes the hash table collision flaw
which could be exploited by attackers to cause a Denial of
Service (CVE-2012-0841).

Fixed bugs
bnc#748561
VUL-0: CVE-2012-0841: libxml2: hash table collisions CPU usage DoS
Selected Binaries
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