parse-duration.sh: read -u3 non-portable

[Simon Josefsson]

test-parse-duration fails on Solaris [1]:

./test-parse-duration.sh: -u3: is not an identifier
FAIL: test-parse-duration.sh

How about the patch below?  Seems to work here.

/Simon

[1] http://autobuild.josefsson.org/gnulib/log-200905311157044761000.txt

diff --git a/tests/test-parse-duration.sh b/tests/test-parse-duration.sh
index 1200561..6aeb225 100755
--- a/tests/test-parse-duration.sh
+++ b/tests/test-parse-duration.sh
@@ -60,7 +60,7 @@ cat > "${tmpf}" <<- _EOF_
        _EOF_
 
 exec 3< "${tmpf}"
-while read -u3 line
+while read line <&3
 do
     v=`${exe} "${line}"` || { ls -l "${tmpf}"; die "Failed: ${exe} '${line}'"; 
}
     test $v -eq 38898367 || die $v is not 38898367