component/graphviz: add explicit rpath.

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passed Cloudooo.UnitTest-Master

00:15:40

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

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passed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python3

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failed SlapOS.Eggs.UnitTest-Master.Python3Next

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passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

08:45:12