libnative/io: generic retry() for Unix 64 bit read/write().

Win32/WinSock APIs never call WSASetLastError() with WSAEINTR
unless a programmer specifically cancels the ongoing blocking call by
a deprecated WinSock1 API WSACancelBlockingCall().
So the errno check was simply removed and retry() became an id function
on Windows.
Note: Windows' equivalent of SIGINT is always handled in a separate thread:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms682541%28v=vs.85%29.aspx
"CTRL+C and CTRL+BREAK Signals"

Also, incidentally rename a type parameter and clean up some module imports.

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