Log Message:
Update "xservers" package to version 3.3.6.4. Changes:
- Provide a normal downloadable distribution file because this is much more
  convenient after XFree86 3.3.6 was removed from the CVS sources.
- Fix buildlink issued which caused shared library runtime path problems.
- Compile the libraries without thread support. They aren't used by
  anything but "xkbcomp" and the server. And neither of those uses threads.
  BTW: this does *not* limit the server's ability to handle threaded X11
  applications.