Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxslt/libexslt/exslt.c

 #define IN_LIBEXSLT
 #include "libexslt/libexslt.h"
 
 #include <libxml/xmlversion.h>
 
 #include "config.h"
 
 #include <libxslt/xsltconfig.h>
 #include <libxslt/extensions.h>
 
-#include "exsltconfig.h"
+#include <libexslt/exsltconfig.h>
 #include "exslt.h"
 
-const char *exsltLibraryVersion = LIBEXSLT_VERSION_STRING 
+const char *exsltLibraryVersion = LIBEXSLT_VERSION_STRING
                                 LIBEXSLT_VERSION_EXTRA;
 const int exsltLibexsltVersion = LIBEXSLT_VERSION;
 const int exsltLibxsltVersion = LIBXSLT_VERSION;
 const int exsltLibxmlVersion = LIBXML_VERSION;
 
 /**
  * exsltRegisterAll:
  *
  * Registers all available EXSLT extensions
  */
 void
 exsltRegisterAll (void) {
     xsltInitGlobals();
     exsltCommonRegister();
 #ifdef EXSLT_CRYPTO_ENABLED
     exsltCryptoRegister();
 #endif
     exsltMathRegister();
     exsltSetsRegister();
     exsltFuncRegister();
     exsltStrRegister();
     exsltDateRegister();
     exsltSaxonRegister();
     exsltDynRegister();
 }