only set PWD if it is already set (and likely wrong). from p3.

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+Fri Sep 18 00:32:00 1992  Mark Eichin  (eichin@cygnus.com)
+
+       * configure: only set PWD if it is already set.
+
 Thu Sep 17 23:05:53 1992  Mark Eichin  (eichin@cygnus.com)
 
        * configure: just set PWD=`pwd` at the top, since Ultrix sh