[m-dev.] diff: detect linking with inconsistent grades

[Fergus Henderson]

David Glen JEFFERY, you wrote:
> > +** IMPORTANT: any changes here will probably require similar
> > +** changes to compiler/handle_options.m and scripts/mgnuc.in.
> > +*/
> 
> How about a similar comment in handle_options.m and mgnuc.in?

Done.

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