sockets: FD_CLOEXEC
sockets: FD_CLOEXEC

If the user code forks, it inherits open copies of all
lws sockets, which conflict if lws later decides to
close them.
sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets