libfdisk: (dos) use script label-id

Signed-off-by: Karel Zak <kzak@redhat.com>
build-sys: add hint about 'make'

Signed-off-by: Karel Zak <kzak@redhat.com>
libfdisk: (gpt) parse attr bits

Signed-off-by: Karel Zak <kzak@redhat.com>
sfdisk: add --part-attrs

Signed-off-by: Karel Zak <kzak@redhat.com>