Change strerror so that it never returns an empty string.

[pspp] / ChangeLog

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+2007-10-26  Bruno Haible  <bruno@clisp.org>
+
+       * lib/strerror.c (rpl_strerror): Return "Unknown error ..." also if
+       strerror returned the empty string. Needed on HP-UX 11.00.
+
 2007-10-24  Micah Cowan  <micah@cowan.name>
 
        Remove vestiges of cvs-gnulib-checkout process.  Now we use git.