Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/src/python/README

+                Module libxml2-python
+                =====================
+
+This is the libxml2 python module, providing access to the
+libxml2 and libxslt (if available) libraries. For general
+informationss on those XML and XSLT libraries check their 
+web pages at :
+    http://xmlsoft.org/
+    and
+    http://xmlsoft.org/XSLT/
+
+The latest version of the sources for this module and the
+associated libraries can be found at:
+    ftp://xmlsoft.org/
+
+Binaries packages of the libxml2 and libxslt libraries can
+be found either on the FTP site for Linux, from external
+sources linked from the web pages, or as part of your set of
+packages provided with your operating system.
+
+NOTE:
+this module distribution is not the primary distribution
+of the libxml2 and libxslt Python binding code, but as 
+the Python way of packaging those for non-Linux systems.
+The main sources are the libxml2 and libxslt tar.gz found on
+the site. One side effect is that the official RPM packages for
+those modules are not generated from the libxml2-python
+distributions but as part of the normal RPM packaging of
+those two libraries.
+The RPM packages can be found at:
+    http://rpmfind.net/linux/rpm2html/search.php?query=libxml2-python
+    http://rpmfind.net/linux/rpm2html/search.php?query=libxslt-python
+
+Daniel Veillard