[m-rev.] for post-commit review: specialize some folds

[Zoltan Somogyi]

For review by anyone.

Note that I am not worried about the extra cross-module
dependencies added by this series of diffs, because at the end,
I intend to move code around between make*.m to make
each module's cohesion at least as good as it was before,
if not better.

Zoltan.
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