Update libxml to 2.7.7.

third_party/libxml/pattern.c

 /*
  * pattern.c: Implemetation of selectors for nodes
  *
  * Reference:
  *   http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/
  *   to some extent 
  *   http://www.w3.org/TR/1999/REC-xml-19991116
  *
  * See Copyright for the status of this software.
  *
@@ skipping 2267 matching lines @@
     
     if (stream == NULL)
         return(-1);
     while (stream != NULL) {
         /*
         * Reset block-level.
         */
         if (stream->blockLevel == stream->level)
             stream->blockLevel = -1;
 
-        stream->level--;
-        if (stream->level < 0)
-            return(-1);         
+        /*
+         *  stream->level can be zero when XML_FINAL_IS_ANY_NODE is set
+         *  (see the thread at
+         *  http://mail.gnome.org/archives/xslt/2008-July/msg00027.html)
+         */
+        if (stream->level)
+            stream->level--;
         /*
          * Check evolution of existing states
          */     
         for (i = stream->nbState -1; i >= 0; i--) {
             /* discard obsoleted states */
             lev = stream->states[(2 * i) + 1];
             if (lev > stream->level)
                 stream->nbState--;
             if (lev <= stream->level)
                 break;
@@ skipping 299 matching lines @@
             return(1);
         comp = comp->next;
     }
     return(0);
 
 }
 
 #define bottom_pattern
 #include "elfgcchack.h"
 #endif /* LIBXML_PATTERN_ENABLED */