Link Windows build to wsock32.dll again

Link the Windows build to wsock32.dll for ntohl() again instead of
trying to provide an own implementation.

(Partial revert of commit d0647a4f8650f92057274f2412bb8aa79f71a242.)

This will be rendered unnecessary by the forthcoming 1.3.0 release of
libflac that removes the call to ntohl().