blkid: recognize ext4(dev) without journal

blkid: recognize ext4(dev) without journal

ext4/ext4dev no longer require a journal.

w/o this blkid doesn't recognize after:

We still must have one ext3-incompat-feature to flag
as ext4(dev) so we shouldn't ever mis-recognize it.

[kzak@redhat.com: port from e2fsprogs to util-linux-ng tree]

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Karel Zak <kzak@redhat.com>