RFR 6722928: Support SSPI as a native GSS-API provider

[Weijun Wang]

Please take a review at

   https://cr.openjdk.java.net/~weijun/6722928/webrev.01/

We ported [1] the native GSS bridge to Windows in JDK 11, but user still have to download and install a native GSS-API library. This code change provides a native GSS-API library inside JDK that can be used without setting the "sun.security.jgss.lib" system property. It is based on Windows SSPI and now only supports the client side using the default credentials.

No regression tests included. A Windows Active Directory server is needed.

Thanks
Max

[1] https://bugs.openjdk.java.net/browse/JDK-8200468