RFR: 8298619: java/io/File/GetXSpace.java is failing [v4]

[Brian Burkhalter]

> Modify the `Space` instances used for size comparison to be created with total number of bytes derived from the Windows `diskFree` utility instead of Cygwin’s `df`.

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

  8305157: Clean up

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12397/files
  - new: https://git.openjdk.org/jdk/pull/12397/files/114857c1..9ae317e7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12397&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12397&range=02-03

  Stats: 14 lines in 2 files changed: 7 ins; 6 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12397.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/12397/head:pull/12397

PR: https://git.openjdk.org/jdk/pull/12397