cmake HEADLESS_HAS_GLFW examples

STORM-IRIT/Radium-Engine src/Headless/CMakeLists.txt :39

target_compile_definitions(
            ${ra_headless_target} PUBLIC HEADLESS_HAS_GLFW PRIVATE GLFW_INCLUDE_NONE
        )

STORM-IRIT/Radium-Engine src/Headless/CMakeLists.txt :44

set_target_properties(
            ${ra_headless_target} PROPERTIES HEADLESS_HAS_GLFW ${HEADLESS_HAS_GLFW}
        )