[m-rev.] for review: determine more minimal dependency relations

[Michael Day]

> After this change is committed, I will be able to go back to my earlier
> plan of converting the Mercury compiler to use sub-modules, with each
> module in the compiler being a sub-module of one of the major components
> (e.g. `ll_backend', `ml_backend', etc.).

One point about that sort of thing... it's very inconvenient when you have
twenty files all with the same prefix, as it screws up filename completion
for those of us who depend up on bash and the tab key. In my own projects
I've often wished to place sub-modules in a directory named after the
parent, but don't know what kind of mmake whackery would be required to
make that work...

Michael

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