Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/src/include/libxml/xmlerror.h

Index: third_party/libxml/src/include/libxml/xmlerror.h
diff --git a/third_party/libxml/src/include/libxml/xmlerror.h b/third_party/libxml/src/include/libxml/xmlerror.h
index 10be606818a274c8d8c854dc649ccbcab0c618d5..43e68ca593536fda98b0ac8c008fe21c582597d8 100644
--- a/third_party/libxml/src/include/libxml/xmlerror.h
+++ b/third_party/libxml/src/include/libxml/xmlerror.h
@@ -62,7 +62,9 @@ typedef enum {
     XML_FROM_WRITER,	/* The xmlwriter module */
     XML_FROM_MODULE,	/* The dynamically loaded module module*/
     XML_FROM_I18N,	/* The module handling character conversion */
-    XML_FROM_SCHEMATRONV	/* The Schematron validator module */
+    XML_FROM_SCHEMATRONV,/* The Schematron validator module */
+    XML_FROM_BUFFER,    /* The buffers module */
+    XML_FROM_URI        /* The URI module */
 } xmlErrorDomain;
 
 /**
@@ -84,7 +86,7 @@ struct _xmlError {
     char       *str2;	/* extra string information */
     char       *str3;	/* extra string information */
     int		int1;	/* extra number information */
-    int		int2;	/* column number of the error or 0 if N/A (todo: rename this field when we would break ABI) */
+    int		int2;	/* error column # or 0 if N/A (todo: rename field when we would brk ABI) */
     void       *ctxt;   /* the parser context if available */
     void       *node;   /* the node in the tree */
 };
@@ -205,7 +207,8 @@ typedef enum {
     XML_WAR_ENTITY_REDEFINED, /* 107 */
     XML_ERR_UNKNOWN_VERSION, /* 108 */
     XML_ERR_VERSION_MISMATCH, /* 109 */
-    XML_ERR_USER_STOP, /* 110 */
+    XML_ERR_NAME_TOO_LONG, /* 110 */
+    XML_ERR_USER_STOP, /* 111 */
     XML_NS_ERR_XML_NAMESPACE = 200,
     XML_NS_ERR_UNDEFINED_NAMESPACE, /* 201 */
     XML_NS_ERR_QNAME, /* 202 */
@@ -826,11 +829,8 @@ typedef enum {
     XML_I18N_NO_HANDLER, /* 6001 */
     XML_I18N_EXCESS_HANDLER, /* 6002 */
     XML_I18N_CONV_FAILED, /* 6003 */
-    XML_I18N_NO_OUTPUT /* 6004 */
-#if 0
-    XML_CHECK_, /* 5033 */
-    XML_CHECK_X /* 503 */
-#endif
+    XML_I18N_NO_OUTPUT, /* 6004 */
+    XML_BUF_OVERFLOW = 7000
 } xmlParserErrors;
 
 /**