cmake HAS_VOLUMES examples

STORM-IRIT/Radium-Engine examples/CMakeLists.txt :40 

get_target_property(HAS_VOLUMES Radium::IO IO_HAS_VOLUMES)

STORM-IRIT/Radium-Engine src/Gui/CMakeLists.txt :56 

get_target_property(HAS_VOLUMES IO IO_HAS_VOLUMES)

STORM-IRIT/Radium-Engine tests/unittest/CMakeLists.txt :48 

get_target_property(HAS_VOLUMES IO RADIUM_IO_HAS_VOLUMES)