Windows bind() with SO_EXCLUSIVEADDRUSE to fail if socket in use.
Windows bind() with SO_EXCLUSIVEADDRUSE to fail if socket in use.

On Windows, SO_REUSEADDR will happily bind to a socket that is already
in use and the windows-specific SO_EXCLUSIVEADDRUSE is needed instead.
This is defined in winsock2.h.  Defined lean and mean because winsock2
comes in without conflicts that way.

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