Windows EAFNOSUPPORT defined by VS2010
Windows EAFNOSUPPORT defined by VS2010

EAFNOSUPPORT is defined by VS2010 errno.h.   Use the VS2010
value instead of WSAEAFNOSUPPORT if EAFNOSUPPORT is not defined.

Change-Id: Ie641fd8f212ea1be11811dbb2e0def9fdbac795f

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