Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/src/win32/VC10/README.vc10

Index: third_party/libxml/src/win32/VC10/README.vc10
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+
+README file for VC10 project files for libxml2
+----------------------------------------------
+
+to clarify: This is not the readme file for the whole libxml2 project. 
+Rather, it's a readme for the VC10 project files, attached to the libxml2 proejct.
+
+Quick Start
+-----------
+
+1) To use, load the libxml2.sln solution file into visual studio
+2) check and correct paths for dependent "iconv" project which most certaily 
+are wrong on your environment.
+3) Compile all projects
+
+
+Background Info
+---------------
+
+Running of "configure.sh" won't make sense since VS doesn't support
+this kind of build system and the environment is pretty much known already 
+if you're using Visual Studio. Instead, a preconfigured "config.h" file 
+is provided in the "win32\VC10" directory and referenced by the project
+files already.
+
+The compile process is not completely warning-free: Some warnings will 
+appear during compile which can be ignored.