[m-rev.] for review: make compiler use sub-modules

[Peter Ross]

There is only one issue that I have discovered with sub-modules and that
is that we appear to output the following rules.  This has only been
deduced from the operational semantics of running mmake -j2

parent.sub.int0:
    mmc --make-private-interface parent.m

parent.int0:
    mmc --make-private-interface parent.m

so in the presence of multiple processes it is possible to run the same
mmc command at the same time.

I haven't looked into this further, I was hoping to do it sometime
today.

Pete

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