Patch to enable build on s390x

[Stephen Powell]

Oops!  Forgot to CC you guys.  I'm used to posting to the list only
(debian-s390 at lists.debian.org), but upon further review some of the ids
will obviously not be subscribed.  I didn't copy Philipp Kern, since I
know he reads the list.  Anyway, please see my reply to Steve Robbins
here:

   http://lists.debian.org/debian-s390/2011/09/msg00010.html

-- 
  .''`.     Stephen Powell    
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