Don't test du's -b option here. Directory byte

counts are smaller (512 rather than 4096) on at least OSF/1 5.1
and IBM AIX 4.2.

tests/du/basic

@@ -37,8 +37,6 @@ echo === >> out
 du -aS a >> out || fail=1
 echo === >> out
 du -s a >> out || fail=1
-echo === >> out
-du -abS a >> out || fail=1
 cat <<\EOF > exp
 4	a/b/c
 8	a/b
@@ -49,10 +47,6 @@ cat <<\EOF > exp
 4	a
 ===
 12	a
-===
-32	a/b/c
-4096	a/b
-4096	a
 EOF
 
 cmp out exp || fail=1