Update libxml to 2.7.7.

third_party/libxml/xmlcatalog.c

 /*
  * xmlcatalog.c : a small utility program to handle XML catalogs
  *
  * See Copyright for the status of this software.
  *
  * daniel@veillard.com
  */
 
 #include "libxml.h"
 
@@ skipping 106 matching lines @@
                (*cur != '\n') && (*cur != '\r')) {
             if (*cur == 0)
                 break;
             command[i++] = *cur++;
         }
         command[i] = 0;
         if (i == 0) {
             free(cmdline);
             continue;
         }
-        nbargs++;
 
         /*
          * Parse the argument string
          */
         memset(arg, 0, sizeof(arg));
         while ((*cur == ' ') || (*cur == '\t')) cur++;
         i = 0;
         while ((*cur != '\n') && (*cur != '\r') && (*cur != 0)) {
             if (*cur == 0)
                 break;
             arg[i++] = *cur++;
         }
         arg[i] = 0;
-        if (i != 0) 
-            nbargs++;
 
         /*
          * Parse the arguments
          */
         i = 0;
         nbargs = 0;
         cur = arg;
         memset(argv, 0, sizeof(argv));
         while (*cur != 0) {
             while ((*cur == ' ') || (*cur == '\t')) cur++;
@@ skipping 455 matching lines @@
     xmlCleanupParser();
     xmlMemoryDump();
     return(exit_value);
 }
 #else
 int main(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED) {
     fprintf(stderr, "libxml was not compiled with catalog and output support\n");
     return(1);
 }
 #endif