Detect version of graphviz, to set preprocessor definitions properly; for backward compatibility with graphviz < 2.36.
Detect version of graphviz, to set preprocessor definitions properly; for backward compatibility with graphviz < 2.36.

FedoraScientific/salome-kernel,FedoraScientific/salome-kernel,FedoraScientific/salome-kernel,FedoraScientific/salome-kernel