Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/src/testThreads.c

 #include "libxml.h"
 
 #include <stdlib.h>
 #include <stdio.h>
 
 #if defined(LIBXML_THREAD_ENABLED) && defined(LIBXML_CATALOG_ENABLED) && defined(LIBXML_SAX1_ENABLED)
 #include <libxml/globals.h>
 #include <libxml/threads.h>
 #include <libxml/parser.h>
 #include <libxml/catalog.h>
@@ skipping 87 matching lines @@
 {
     unsigned int i, repeat;
     unsigned int num_threads = sizeof(testfiles) / sizeof(testfiles[0]);
     void *results[MAX_ARGC];
     int ret;
 
     xmlInitParser();
     for (repeat = 0;repeat < 500;repeat++) {
         xmlLoadCatalog(catalog);
 
-        for (i = 0; i < num_threads; i++) {
-            results[i] = NULL;
-            tid[i] = (pthread_t) -1;
-        }
+        memset(results, 0, sizeof(*results)*num_threads);
+        memset(tid, 0xff, sizeof(*tid)*num_threads);
 
         for (i = 0; i < num_threads; i++) {
             ret = pthread_create(&tid[i], NULL, thread_specific_data,
                                  (void *) testfiles[i]);
             if (ret != 0) {
                 perror("pthread_create");
                 exit(1);
             }
         }
         for (i = 0; i < num_threads; i++) {
@@ skipping 71 matching lines @@
 #endif /* pthreads or BeOS threads */
 
 #else /* !LIBXML_THREADS_ENABLED */
 int
 main(void)
 {
     fprintf(stderr, "libxml was not compiled with thread or catalog support\n");
     return (0);
 }
 #endif