Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/src/enc.h

+/*
+ * Summary: Internal Interfaces for encoding in libxml2
+ * Description: this module describes a few interfaces which were
+ *              addded along with the API changes in 2.9.0
+ *              those are private routines at this point
+ *
+ * Copy: See Copyright for the status of this software.
+ *
+ * Author: Daniel Veillard
+ */
+
+#ifndef __XML_ENC_H__
+#define __XML_ENC_H__
+
+#include <libxml/tree.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int xmlCharEncFirstLineInt(xmlCharEncodingHandler *handler, xmlBufferPtr out,
+                           xmlBufferPtr in, int len);
+int xmlCharEncFirstLineInput(xmlParserInputBufferPtr input, int len);
+int xmlCharEncInput(xmlParserInputBufferPtr input, int flush);
+int xmlCharEncOutput(xmlOutputBufferPtr output, int init);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* __XML_ENC_H__ */
+
+