RFR: 8264400: (fs) WindowsFileStore equality depends on how the FileStore was constructed [v2]

[Brian Burkhalter]

> Please consider this change to make `sun.nio.fs.WindowsFileStore.equals()` return `true` if the root strings of the two objects are equal under case insensitive comparison, and the two `WindowsFileStore`s have the same volume information.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8264400: Constrain to DRIVE_LOCAL case

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3279/files
  - new: https://git.openjdk.java.net/jdk/pull/3279/files/30587898..9260dfde

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3279&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3279&range=00-01

  Stats: 28 lines in 1 file changed: 16 ins; 5 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3279.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3279/head:pull/3279

PR: https://git.openjdk.java.net/jdk/pull/3279