RFR: 8048212 Two tests failed with "java.net.SocketException: Bad protocol option" on Windows after 8029607

[Michael McMahon]

Could I get the following change reviewed please?

http://cr.openjdk.java.net/~michaelm/8048212/webrev.1/

It fixes a problem caused by the fix for 8029607. The changes for
that fix should not have been applied to Windows. So, this fix ensures
that the IPv4 option is used always on Windows.

Michael