[Patch, fortran] PR122089 - generic resolution problem with composite PDT

[Paul Richard Thomas]

The testcase was failing at
interface.cc(gfc_compare_derived_types):683 and so a specific
procedure was not being found. I posted a "fix" on the PR, which works
but is incorrect. The attached fixes this by ensuring that PDT
instances of a use associated PDT template, take the use association
and module name from the template. This allows the strcmp to pass and
the generic matching to succeed.

Regtested on FC42/x86_64. OK for mainline?

Paul
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