cmake BOOST_ASIO_HAS_IO_URING examples

ceph/ceph CMakeLists.txt :284 

add_compile_definitions("BOOST_ASIO_HAS_IO_URING")

apple/foundationdb fdbserver/CMakeLists.txt :146 

target_compile_definitions(fdbserver PRIVATE BOOST_ASIO_HAS_IO_URING=1 BOOST_ASIO_DISABLE_EPOLL=1)