[bug#27657] [PATCH] gnu: graphviz: Update to 2.40.1.

[Arun Isaac]

>> Several of the inputs don't seem to be required. graphviz builds
>> successfully and without any change of features (as reported by the
>> configure phase) when built without those inputs.
>>
>> Also, I think the swig input should actually be a native input.
>>
>> I'll shortly send a patch with these changes. Do review and offer
>> feedback.
>
> Did you compare our package to the Graphviz project's annotated list of
> dependencies, found in the link below?
>
> http://www.graphviz.org/Download_source.php
>
> Some of the removed dependencies seem to have a use in graphviz.

Going by that list, I have wrongly removed only expat and libpng. What
about the other inputs I have removed?