cmake ASIO_GRPC_BOOST_ASIO_HAS_CO_AWAIT examples

Tradias/asio-grpc cmake/AsioGrpcCheckBoostVersion.cmake :16 

try_compile(
        ASIO_GRPC_BOOST_ASIO_HAS_CO_AWAIT "${CMAKE_CURRENT_BINARY_DIR}"
        "${CMAKE_CURRENT_LIST_DIR}/check_boost_asio_has_co_await.cpp"
        CMAKE_FLAGS "-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
        LINK_LIBRARIES Boost::headers CXX_STANDARD 20 CXX_STANDARD_REQUIRED on)

Tradias/asio-grpc cmake/AsioGrpcCheckBoostVersion.cmake :23 

message(STATUS "ASIO_GRPC_BOOST_ASIO_HAS_CO_AWAIT: ${ASIO_GRPC_BOOST_ASIO_HAS_CO_AWAIT}")