cmake _vtk_find_package_PACKAGE examples

Kitware/VTK CMake/vtkModule.cmake :5375 

find_package("${_vtk_find_package_PACKAGE}"
    ${_vtk_find_package_VERSION}
    ${_vtk_find_package_config}
    COMPONENTS          ${_vtk_find_package_COMPONENTS}
    OPTIONAL_COMPONENTS ${_vtk_find_package_OPTIONAL_COMPONENTS})