cmake HAVE_SOCKET_H examples

gridlab-d/gridlab-d cmake/CheckDependencies.cmake :20 

CHECK_INCLUDE_FILES(sys/socket.h HAVE_SOCKET_H)

fluent/fluent-bit lib/c-ares-1.34.4/CMakeLists.txt :218 

CHECK_INCLUDE_FILES (socket.h              HAVE_SOCKET_H)