[m-rev.] for possible objection: delete strange fallback code in deps_map.m

[Zoltan Somogyi]

The diff is trivial, I am posting this just in case someone knows
the reason for the existence of the code that this diff deletes,
and thinks it should be kept. Since I don't think that is likely,
and I am working on a diff that builds on this, any objections
will have to be post-commit. (The diff passes a bootcheck.)

Zoltan.
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