blkid: hfs - use proper native UUID format

blkid: hfs - use proper native UUID format

Here is the md5'd UUID for hfs:
  $ LD_LIBRARY_PATH=libs/blkid/src/ libs/blkid/bin/blkid ../../volume_images/hfs-extended.img
  UUID="56a19597-a3c8-325d-9df2-f30bc6f8ac09" LABEL="I am HFS Extended" TYPE="hfsplus"

  $ /lib/udev/vol_id ../../volume_images/hfs-extended.img
  ID_FS_USAGE=filesystem
  ID_FS_TYPE=hfsplus
  ID_FS_VERSION=
  ID_FS_UUID=56a19597-a3c8-325d-9df2-f30bc6f8ac09
  ID_FS_UUID_ENC=56a19597-a3c8-325d-9df2-f30bc6f8ac09
  ID_FS_LABEL=I_am_HFS_Extended
  ID_FS_LABEL_ENC=I\x20am\x20HFS\x20Extended

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>