Add warning about SOCK_CLOEXEC and SOCK_NONBLOCK (r248534).
Add warning about SOCK_CLOEXEC and SOCK_NONBLOCK (r248534).

Reviewed by:	rpaulo

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase