Graphviz test-suite probably requires ksh-93

This bug is for myself as a reference and to close it once we have

fixed the comment in the graphviz package.

If you read https://github.com/ellson/graphviz/issues/1267you'll

find out that ksh-93, which we don't have (yet) is the shell which

should be able to run the test suite of graphviz.

I'm currently debugging the build of ksh-93 and I also need to read

every header of it to check if we have one bit of AT&T proprietary

copyright in there. As fedora packages it, the chances are high that

it can just be used as-is, but we should check it nevertheless.

--

ng0

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