+ uses `mkisofs' rather than `mkhybrid' as the new mkisofs is the merger
of the two
+ checks for `setcdboot's existsance and tries to pkg_add it if needed
+ removes English contraction
Approved by: jkh
as part of the release if MAKE_ISOS is set. Will also build the
first CD with packages (in addition to the "minimal" CD) if CD_EXTRA_BITS
points to them. This probably need a bit more work to get fully useful,
but it at least covers the basics for now.
