[m-rev.] for post-commit review: move cache ops to make.deps_cache.m ...

[Zoltan Somogyi]

... and make the new machinery in make.dependencies.m
do all the caching that the old machinery does.

Given this fact, and that the new machinery, which has been
in operation since oct 4, has not had any reported failures,
would anyone object if I deleted the old machinery over
the weekend?

Zoltan.
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