byte) disklabels even in the midst of a larger sector. E.g. in bytes
512 - 1023 of the first 2048 byte sector on a CD.
On hppa we plopped down such a disklabel on cdXX.iso and installXX.iso.
Once accessible it took precedence over the spoofed label of the CD. Chaos
ensued. Since there is currently no reason for this label on hppa
cd's, eradicate it and its disktab entry. cdXX.iso/installXX.iso can now
be mounted on hppa again.
Also remove a commented out label plopping on Alpha, which references a
non-existant disktab entry.
Problem noted and exact diff creating problem discovered by marco@.
ok deraadt@

disklabel the "HP C3010 / Cranel 2.0GB Fast SCSI2 H10" crammed inside your
palm device, but that's the price of progress.  hopefully i didn't whack
anything important.
ok deraadt

bootblocks have been moved, but we want 4.2 to be upgradeable.  So
reduce the footprint of the bsd.rd by shrinking the ramdisk filesystem
because it is way too large.  tested by sthen and kettenis