Standardize behaviour of graphviz. When GRAPHVIZ_ROOT_DIR cmake var is NOT defined and that dot is in the path now it works.
Standardize behaviour of graphviz. When GRAPHVIZ_ROOT_DIR cmake var is NOT defined and that dot is in the path now it works.

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