Update to libxml2 2.9.4 by merging commit 'd8083bf7' into klp-dev.

Bug: 32956747
Change-Id: I04c5bdea11733cc8dab6244f4a1bf33f0ff66277
(cherry-picked from 312a2fc2f0200bbb187771f25e08ed5afd447e40)
63 files changed