RFR (S): 8022452: Hotspot needs to know about Windows 8.1 and Windows Server 2012 R2

[Mikael Vidstedt]

Please review the following change:

http://cr.openjdk.java.net/~mikael/webrevs/8022452/webrev

The patch adds support to os_windows.cpp for recognizing the upcoming 
Windows versions: Windows 8.1 and Windows Server 2012 R2.

The changed is based on the corresponding code on the JDK side[1][2][3].

Thanks,
Mikael

[1] http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8020191
[2] http://hg.openjdk.java.net/jdk8/tl/jdk/rev/40221b09812f
[3] 
http://mail.openjdk.java.net/pipermail/core-libs-dev/2013-July/019463.html