RFR: 8154208: (fs) Drop code for Windows XP/2003 from file system provider

[Claes Redestad]

Hi,

as Windows XP/2003 support is being dropped in JDK 9, code support for 
dealing with these can be dropped from the Windows file system provider.

Webrev: http://cr.openjdk.java.net/~redestad/8154208/webrev.01/
Bug: https://bugs.openjdk.java.net/browse/JDK-8154208

Passes all jdk_nio tests in JPRT

Thanks!

/Claes