hg: jdk10/sandbox/jdk: 8182710: File.listRoots() always returns the root of CD drive

[chris.hegarty at oracle.com]

Changeset: 9065d9d6c3e0
Author:    bpb
Date:      2017-06-29 13:40 -0700
URL:       http://hg.openjdk.java.net/jdk10/sandbox/jdk/rev/9065d9d6c3e0

8182710: File.listRoots() always returns the root of CD drive
Summary: Include only logical drives with an extant filesystem location
Reviewed-by: clanger, rriggs, plevart, tvaleev

! src/java.base/windows/classes/java/io/WinNTFileSystem.java