Upgrade libxml to 2.9.1

Bug: 7246045

Change-Id: I8d0abc6b9e3f691f6e282a8912d1af7b24b21aa5
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..cf2e9a6
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,5 @@
+Daniel Veillard <daniel@veillard.com>
+Bjorn Reese <breese@users.sourceforge.net>
+William Brack <wbrack@mmm.com.hk>
+Igor Zlatkovic <igor@zlatkovic.com> for the Windows port
+Aleksey Sanin <aleksey@aleksey.com>