Fix the description of the O_NONBLOCK flag to match reality.
Fix the description of the O_NONBLOCK flag to match reality.

Prodded by:	Maxim Konovalov <maxim@macomnet.ru>
Obtained from:	BSD/OS

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