Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/src/include/libxml/relaxng.h

Index: third_party/libxml/src/include/libxml/relaxng.h
diff --git a/third_party/libxml/src/include/libxml/relaxng.h b/third_party/libxml/src/include/libxml/relaxng.h
index bdb0a7d376941d35e46925eb64746de6934319f8..f269c9ec0db27aa5ede24cb7009568c6edb03ebb 100644
--- a/third_party/libxml/src/include/libxml/relaxng.h
+++ b/third_party/libxml/src/include/libxml/relaxng.h
@@ -32,7 +32,9 @@ typedef xmlRelaxNG *xmlRelaxNGPtr;
  *
  * Signature of an error callback from a Relax-NG validation
  */
-typedef void (XMLCDECL *xmlRelaxNGValidityErrorFunc) (void *ctx, const char *msg, ...) LIBXML_ATTR_FORMAT(2,3);
+typedef void (XMLCDECL *xmlRelaxNGValidityErrorFunc) (void *ctx,
+						      const char *msg,
+						      ...) LIBXML_ATTR_FORMAT(2,3);
 
 /**
  * xmlRelaxNGValidityWarningFunc:
@@ -42,7 +44,9 @@ typedef void (XMLCDECL *xmlRelaxNGValidityErrorFunc) (void *ctx, const char *msg
  *
  * Signature of a warning callback from a Relax-NG validation
  */
-typedef void (XMLCDECL *xmlRelaxNGValidityWarningFunc) (void *ctx, const char *msg, ...) LIBXML_ATTR_FORMAT(2,3);
+typedef void (XMLCDECL *xmlRelaxNGValidityWarningFunc) (void *ctx,
+							const char *msg,
+							...) LIBXML_ATTR_FORMAT(2,3);
 
 /**
  * A schemas validation context