RFR: 8264400: (fs) WindowsFileStore equality depends on how the FileStore was constructed [v6]

[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: Remove vestigial FileSystems.getDefault()

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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/e1d7b21a..a53d10f2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3279&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3279&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 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