[patch, fortran] PR16940 - module interfaces to contained procedures

[Tobias Schlüter]

Paul Thomas wrote:
> I would propose committing this patch, whilst raising a PR for some brave 
> soul (I am rooting around in the right places but do not claim to be brave!) 
> to fix the real error.

I guess this is ok, but please add a FIXME comment so that if the real problem
ever gets fixed a person who stumbles over this workaround will remove it :-)

- Tobi