poll/select: document portability problems not fixed by Gnulib. * doc/posix-functions/poll.texi: poll does not work well on pipes under Windows. It has the same limitations as select on BeOS. * doc/posix-functions/select.texi: select does not work well on pipes under Windows.

#!/bin/sh

./test-fseek${EXEEXT} 1 < "$srcdir/test-fseek.sh" || exit 1
echo hi | ./test-fseek${EXEEXT} || exit 1
exit 0