Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxslt/libxslt/xsltconfig.h

Index: third_party/libxslt/libxslt/xsltconfig.h
diff --git a/third_party/libxslt/libxslt/xsltconfig.h b/third_party/libxslt/libxslt/xsltconfig.h
index 1811bd76068b97d662c8291c89a3738478fd8dc7..bea77e4a97e86100a0b2ada10dd087c59f73e411 100644
--- a/third_party/libxslt/libxslt/xsltconfig.h
+++ b/third_party/libxslt/libxslt/xsltconfig.h
@@ -20,28 +20,28 @@ extern "C" {
  *
  * the version string like "1.2.3"
  */
-#define LIBXSLT_DOTTED_VERSION "1.1.26"
+#define LIBXSLT_DOTTED_VERSION "1.1.28"
 
 /**
  * LIBXSLT_VERSION:
  *
  * the version number: 1.2.3 value is 10203
  */
-#define LIBXSLT_VERSION 10126
+#define LIBXSLT_VERSION 10128
 
 /**
  * LIBXSLT_VERSION_STRING:
  *
  * the version number string, 1.2.3 value is "10203"
  */
-#define LIBXSLT_VERSION_STRING "10126"
+#define LIBXSLT_VERSION_STRING "10128"
 
 /**
  * LIBXSLT_VERSION_EXTRA:
  *
  * extra version information, used to show a CVS compilation
  */
-#define	LIBXSLT_VERSION_EXTRA ""
+#define	LIBXSLT_VERSION_EXTRA "-GITv1.1.27-16-g9382efe"
 
 /**
  * WITH_XSLT_DEBUG:
@@ -116,11 +116,11 @@ extern "C" {
  * Whether module support is configured into libxslt
  * Note: no default module path for win32 platforms
  */
-#if 0
+#if 1
 #ifndef WITH_MODULES
 #define WITH_MODULES
 #endif
-#define LIBXSLT_DEFAULT_PLUGINS_PATH() "NULL"
+#define LIBXSLT_DEFAULT_PLUGINS_PATH() "/usr/lib/libxslt-plugins"
 #endif
 
 /**