[m-rev.] diff: fix pragma export bug with foreign types

[Peter Ross]

fjh wrote:
> But I don't understand why this would be different between the LLDS and
> MLDS back-ends.  The C interface should be the same for both, shouldn't
it?
>
The MLDS backend uses the function mlds_output_pragma_export_type to output
the exported interface, while the LLDS backend uses type_to_string (which
gives back the string representing the foreign type), which is why we need a
differenent predicate to give back the typename when it is to be exported.

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