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Fix Graphviz cmake module

Rosen Matev requested to merge rmatev-graphviz into master

This fixes the Graphviz cmake module, which now finds the LCG installation. I've no experience with cmake modules so I've mostly copied Gaudi's FindXrootd.cmake. Please comment if this is better done differently.

Most notably this will allow to have the dot executable in the runtime PATH. I don't think we compile and link against the Graphviz anywhere.

This is expected to have no effect on the builds and tests.

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