and having close() #defined to my_close() in nbase_winunix.h, I'm just defining close()
to closesocket() in nbase_winunix.h and removing my_close() from winfix.cc. I'm also
defining EWOULDBLOCK to WSAEWOULDBLOCK in nbase_winunix.h.
Nmap builds fine with these changes, and since it's just defining close() to something
that already exists, it shouldn't negatively affect other branches.
These are things I noticed while trying to cleanly "re-port" Ncat to VC++2008.
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