Support Sun VTOC partition tables

[pulkomandy]

Native format for sparc workstations. Required also for boot CDs.

FreeBSD implementation:

• ​https://github.com/freebsd/freebsd/blob/1d6e4247415d264485ee94b59fdbc12e0c566fd0/sys/sys/disk/vtoc.h
• ​https://github.com/freebsd/freebsd/blob/master/sys/geom/part/g_part_vtoc8.c

Other possibly relevant info:

• ​http://www.introcomp.co.uk/solaris/rdlabel.html
• ​http://www.trash.net/~lkarrer/projects/solcdburn/solcdburn.html

Test data:

• ​https://archive.org/details/solaris_7_1199_sparc

We will need a kernel add-on for it (to locate the rootfs in the boot CD), as well as some buildtool (possibly similar to "anyboot") to generate said CD.

[pulkomandy]

​https://review.haiku-os.org/c/haiku/+/2709

[waddlesplash]

Merged in hrev54293

[nielx]

Fixed in R1/beta3