cmake HAVE_MEFISTO examples

FreeCAD/FreeCAD src/Mod/MeshPart/App/CMakeLists.txt :6 

add_definitions(-DHAVE_MEFISTO)

FreeCAD/FreeCAD src/Mod/MeshPart/Gui/CMakeLists.txt :4 

add_definitions(-DHAVE_MEFISTO)