[Patch, fortran] PR31154 , PR31229 and PR33334 - use associated or imported function characteristics.

[Paul Richard Thomas]

Dominique,

> On Target: powerpc-apple-darwin8, the patch works as advertised
> on my tests, however I have an unexpected failure:
>
> /opt/gcc/_gcc-clean/gcc/testsuite/gfortran.dg/derived_function_interface_1.f90:13.2:

That's because the testcase is in error:-)  The derived types used in
the interfaces are not declared, use associated or imported.

That said, the patch is not quite right and needs just a bit more work.

Cheers

Paul