8u: RFR(S) + RFA: 8211106: [windows] Update OS detection code to recognize Windows Server 2019

[Langer, Christoph]

Hi,

please review and approve the backport of 8211106 to 8u.
Bug: https://bugs.openjdk.java.net/browse/JDK-8211106
Webrev for hotspot: http://cr.openjdk.java.net/~clanger/webrevs/8211106.8u.hotspot.0/
Webrev for jdk: http://cr.openjdk.java.net/~clanger/webrevs/8211106.8u.jdk.0/

The patch applies with minor fuzz. It would be nice, though, if somebody (Aleksey?) could run it through the Windows build + tests, because our infrastructure is not set up for jdk8u testing on Windows.

Thanks & Best regards
Christoph