Fix non inheritable socket creation on old windows versions

Fix non inheritable socket creation on old windows versions

The documentation is misleading, as using the new API actually
causes WSASocket to fail.
New behaviour:
On windows vista or earlier: skip the new API, use old one
On windows 7: try the new API first, if it fails try the old one
On windows 8: try the new API only

The windows 7 behaviour is because we don't know if the service
pack has been installed or not. (And IT departments may have
specifically installed/blocked the hotfix)

Task-number: QTBUG-26224
Change-Id: I6da47959919caee0cd2697f1ae1fca46aa33c1ff
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Mikhail Vorozhtsov