WINSOCK: fix WSAStringToAddress

[Hans Leidekker]

I found that our WSAStringToAddress can't translate the address
255.255.255.255. From 'man inet_addr':

 If the input is invalid, INADDR_NONE (usually -1) is returned.
 This is an obsolete interface to inet_aton, described immediately
 above; it is obsolete because -1 is a valid address (255.255.255.255),
 and inet_aton provides a cleaner way to indicate error return.

Patch below uses inet_aton instead and extends the tests to catch
this case.

 -Hans

Changelog
  Avoid using the obsolete inet_addr.
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