cmake DORADO_MODELS_HAS_FOUNDATION examples

nanoporetech/dorado dorado/model_downloader/CMakeLists.txt :27 

target_compile_definitions(dorado_model_downloader_lib
    PRIVATE
        DORADO_MODELS_HAS_FOUNDATION=$<BOOL:${APPLE}>
        DORADO_MODELS_HAS_HTTPLIB=1
        DORADO_MODELS_HAS_CURL_EXE=1
)