[Patch,Fortran] PR 44614 Fix diagnostic for IMPORTing CLASS symbols

[Tobias Burnus]

gfortran did not diagnose the use of non-IMPORTed derived types, if they
were used as CLASS - it only diagnosed TYPE. The patch is on the verge
of being obvious.

Build and currently regtesting on x86-64-linux. If it succeeds:
OK for the trunk?

Tobias
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