Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/src/testOOMlib.h

+#ifndef TEST_OOM_LIB_H
+#define TEST_OOM_LIB_H
+
+#include <config.h>
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+void* test_malloc  (size_t      bytes);
+void* test_realloc (void       *memory,
+                    size_t      bytes);
+void  test_free    (void       *memory);
+char* test_strdup  (const char *str);
+
+/* returns true on success */
+typedef int (* TestMemoryFunction)  (void *data);
+
+/* returns true on success */
+int test_oom_handling (TestMemoryFunction  func,
+                       void               *data);
+
+/* get number of blocks leaked */
+int test_get_malloc_blocks_outstanding (void);
+
+#endif