libxml2, python-libxml2: Reverted patch for CVE-2014-0191

Removed fix for CVE-2014-0191. This fix breaks existing applications and there's currently no way to prevent that.

Fixed bugs
bnc#876652
VUL-0: CVE-2014-0191: libxml2: external parameter entity loaded when entity substitution is disabled
Selected Binaries
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