cmake HELLOIMGUI_HAS_METAL examples

pthom/hello_imgui CMakeLists.txt :91 

option(HELLOIMGUI_HAS_METAL "Use Metal as a rendering backend" OFF)

pthom/hello_imgui hello_imgui_cmake/hello_imgui_build_lib.cmake :67 

message(WARNING "
        HELLOIMGUI_USE_SDL_METAL is deprecated,
        use HELLOIMGUI_USE_SDL2 + HELLOIMGUI_HAS_METAL instead")

pthom/hello_imgui hello_imgui_cmake/hello_imgui_build_lib.cmake :74 

message(WARNING "
        HELLOIMGUI_USE_GLFW_METAL is deprecated,
        use HELLOIMGUI_USE_GLFW3 + HELLOIMGUI_HAS_METAL instead")

pthom/hello_imgui hello_imgui_cmake/hello_imgui_build_lib.cmake :882 

target_compile_definitions(${HELLOIMGUI_TARGET} PUBLIC HELLOIMGUI_HAS_METAL)