Update libxml to 2.7.7.

third_party/libxml/xmlschemastypes.c

 /*
  * schemastypes.c : implementation of the XML Schema Datatypes
  *             definition and validity checking
  *
  * See Copyright for the status of this software.
  *
  * Daniel Veillard <veillard@redhat.com>
  */
 
 #define IN_LIBXML
@@ skipping 2881 matching lines @@
                         if (uri != NULL)
                             xmlFree(uri);
                         goto error;
                     }
                 }
                 goto done;
             }
         case XML_SCHEMAS_ANYURI:{               
                 if (*value != 0) {
                     xmlURIPtr uri;
+                    xmlChar *tmpval, *cur;
                     if (normOnTheFly) {             
                         norm = xmlSchemaCollapseString(value);
                         if (norm != NULL)
                             value = norm;
                     }
-                    uri = xmlParseURI((const char *) value);
+                    tmpval = xmlStrdup(value);
+                    for (cur = tmpval; *cur; ++cur) {
+                        if (*cur < 32 || *cur >= 127 || *cur == ' ' ||
+                            *cur == '<' || *cur == '>' || *cur == '"' ||
+                            *cur == '{' || *cur == '}' || *cur == '|' ||
+                            *cur == '\\' || *cur == '^' || *cur == '`' ||
+                            *cur == '\'')
+                            *cur = '_';
+                    }
+                    uri = xmlParseURI((const char *) tmpval);
+                    xmlFree(tmpval);
                     if (uri == NULL)
                         goto return1;
                     xmlFreeURI(uri);
                 }
 
                 if (val != NULL) {
                     v = xmlSchemaNewValue(XML_SCHEMAS_ANYURI);
                     if (v == NULL)
                         goto error;
                     v->value.str = xmlStrdup(value);
@@ skipping 3189 matching lines @@
 xmlSchemaGetValType(xmlSchemaValPtr val)
 {
     if (val == NULL)
         return(XML_SCHEMAS_UNKNOWN);
     return (val->type);
 }
 
 #define bottom_xmlschemastypes
 #include "elfgcchack.h"
 #endif /* LIBXML_SCHEMAS_ENABLED */