o boot/mfsroot.gz is no more. Copy it only when it exists so as still
to be compatible with Makefile.sysinstall.
o while here, make ispfw.ko optional as well.
o '-b bootimage' is not a valid argument for makefs. What was meant
was '-o bootimage'.
o create the boot image in the current directory so that makefs can
find the file. Previously it had to be created under $BASE because
that's how mkisofs wanted it.
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