Fix for PR libc/1686

[Mark Kettenis]

   From: Andreas Jaeger <aj@suse.de>
   Date: 15 Jul 2000 11:52:22 +0200

   Thanks Mark.

   Shouldn't we change the other places also?

   $ grep -r /bin/pwd . 
   ./scripts/rellns-sh:if test -x /bin/pwd; then
   ./scripts/rellns-sh:  pwd=/bin/pwd
   ./scripts/rellns-sh:elif test -x /usr/bin/pwd; then
   ./scripts/rellns-sh:  pwd=/usr/bin/pwd
   ./io/ftwtest-sh:tmpreal=`cd $tmp; /bin/pwd 2>/dev/null || /usr/bin/pwd`

I considered those, but changing those would mean some "real work",
creating rellns-sh from rellns-sh.in or somesuch.  Since the scripts
already look for both /bin/pwd and /usr/bin/pwd, I didn't think it was
important to fix.

By the way, io/ftwtest-sh could use io/pwd that comes with glibc :-).

Mark