Maxim Sobolev f76de5dd51 Add proper support for the md_label into md(4) ioctl compat layer.
While I am here, declare struct md_ioctl32 as packed which allows
us to stop playing tricks with sizeof(md_ioctl32)+y as well as
simplifies md_pad handling. Both were necessary because of different
alignment preferences on amd64 vs i386.

MFC after:	4 weeks
2017-08-30 15:07:10 +00:00
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