The release.9 target is now responsible only for generation of MFS root
file systems, that are built for all architectures, even those that do
not provide a floppy installation option. The release.10 target is now
responsible for creation of a set of boot, MFS root, and fixit floppies,
and the NO_FLOPPIES variable now affects only this target.
Also, replaced the FIXIT_TARGET variable with a check of whether the
*FIXITSIZE variables are present for a given architecture, similar to
how this is done when generating boot floppies.
Discussed with: jhb
b93079f17c