cmake LWS_HAVE_EVENTFD examples

warmcat/libwebsockets lib/plat/unix/CMakeLists.txt :88 

CHECK_FUNCTION_EXISTS(eventfd_read LWS_HAVE_EVENTFD)

c-jimenez/open-ocpp 3rdparty/libwebsockets/lib/plat/unix/CMakeLists.txt :82 

CHECK_FUNCTION_EXISTS(eventfd_read LWS_HAVE_EVENTFD)

fluffos/fluffos src/thirdparty/libwebsockets/lib/plat/unix/CMakeLists.txt :82 

CHECK_FUNCTION_EXISTS(eventfd_read LWS_HAVE_EVENTFD)