handle WSAEADDRINUSE in tcp_connecter_t::connect

As mentioned on the mailing list, Windows may return WSAEADDRINUSE when binding
(reconnecting) to a port. Added this to the handled error codes as Pieter
suggested.
removed whitespace

(accidentially used my preferred style)
Merge pull request #1078 from mkluwe/handle-WSAEADDRINUSE

handle WSAEADDRINUSE in tcp_connecter_t::connect