Tag CVE-2016-4449

Fix inappropriate fetch of entities content

For https://bugzilla.gnome.org/show_bug.cgi?id=761430

libfuzzer regression testing exposed another case where the parser would
fetch content of an external entity while not in validating mode.
Plug that hole

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Commit b1d34de4
Author Daniel Veillard
Date 2016-03-14T17:19:44