IO::Handle::blocking seems to break the socket entity under windows 7
64bit(possible other OS'es).

Attached is an example of breaking code: please adjust the port and
address to something that is open on your side, and then try
uncommenting either of the IO::Handle::blocking calls. The connect will
fail with "unknown error" or "A non-blocking socket operation could not
be completed immediately." depending on the perl distribution.

Please note that $sock->blocking(0) or $sock->blocking(1) will also fail
the same way.

Issue present in both activeperl 5.10.1 and strawberry perl 5.12.1.