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

Update to libxml2 2.9.4 by merging commit 'd8083bf7' into klp-dev. am: 312a2fc2 am: 7e8d493a am: 688b79dd  -s ours am: dcf08c71 am: 4c1605a6 am: 54c98123  -s ours am: 80791df5 am: 148395d4 am: 3b744f8d am: e0571ea2  -s ours am: a9336e58 am: 416c38ea am: 45a309f7
am: 2de5bb50

Change-Id: Ic31f00a71b3511d87d7010d4efa5d5d526c562d9