cmake POCO_HAVE_FD_POLL examples

OriginHubAI/MyScaleDB base/poco/Net/CMakeLists.txt :9 

target_compile_definitions (_poco_net PUBLIC POCO_HAVE_FD_POLL)

chdb-io/chdb base/poco/Net/CMakeLists.txt :9 

target_compile_definitions (_poco_net PUBLIC POCO_HAVE_FD_POLL)

ClickHouse/ClickHouse base/poco/Net/CMakeLists.txt :9 

target_compile_definitions (_poco_net PUBLIC POCO_HAVE_FD_POLL)