Pull up following revision(s) (requested by tsutsui in ticket #1080):
	distrib/utils/sysinst/arch/alpha/md.c: revision 1.53
Apply patch in PR port-alpha/48697 (with some tweaks).
Tru64 UNIX's disklabel is the same format as BSD disklabel,
and it seems Tru64 stores incorrect geometry values in
d_nsectors (sectors/track) and d_secpercyl (sectors/cylinder).
d_secperunit seems always reliable so use it to get
dlsec (sectors/track) and dlcylsize (sectors/cylinder) values.
Should be pulled up to netbsd-6 branches.
Ticket 1080.
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