[m-rev.] for review: extend --warn-unused-types to eqv types

[Zoltan Somogyi]

For review by anyone.

Also, I intend to enable --warn-unused-types in STANDARD_MCFLAGS,
after including it in the "is the installed mmc sufficiently recent" test.
There are a dozen ROTDs with that option.

Zoltan.
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