cmake HAVE_RECVFROM examples

fluent/fluent-bit lib/c-ares-1.34.4/CMakeLists.txt :447 

CHECK_SYMBOL_EXISTS (recvfrom        "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_RECVFROM)

ShadowsocksR-Live/shadowsocksr-native cmake/configure.cmake :136 

check_function_exists(recvfrom HAVE_RECVFROM)