Adjust the CMake configuration to generate grapvhiz files with an
improved layout.
Documentation: https://cmake.org/cmake/help/latest/module/CMakeGraphVizOptions.html
To generate a dependency graph from the build directory (example):
cmake . --graphviz=wireshark.dot
fdp wireshark.dot -Tpdf -o wireshark.pdf
Change-Id: Icf238668004224b9d373d8080e549b9b583f676c
Reviewed-on: https://code.wireshark.org/review/30564
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Michael Mann <mmann78@netscape.net>
Dario Lombardo