[m-rev.] for review: deleting :- external

[Zoltan Somogyi]

The diff is straightforward and does not need review; the review
is for the idea of removing support of :- external. It has always been
an implementors-only part of the language, and it has been replaced
by external_pred and external_func pragmas for several months now.
Unlike :- external, these are NOT ambiguous.

Does anyone know of any code that uses :- external and which
hasn't been updated to use the replacement pragmas instead?

Zoltan.
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