8154454: Fix compilation issue in PlainSocketImpl

Reviewed-by: chegar

jdk/src/java.base/windows/classes/java/net/PlainSocketImpl.java

@@ -80,7 +80,7 @@ class PlainSocketImpl extends AbstractPlainSocketImpl
      * Constructs an instance with the given file descriptor.
      */
     PlainSocketImpl(FileDescriptor fd) {
-        if (useDualStackImpl) {
+        if (!preferIPv4Stack) {
             impl = new DualStackPlainSocketImpl(fd, exclusiveBind);
         } else {
             impl = new TwoStacksPlainSocketImpl(fd, exclusiveBind);