RFR: 8298619: java/io/File/GetXSpace.java is failing [v3]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - 8298619: Change getSpace0() to return a boolean; print warning if total size is estimated instead of exact
 - Merge
 - 8298619: Load GetDiskSpaceInformationW dynamically
 - 8298619: Replace df and diskFree with native calls
 - 8298619: java/io/File/GetXSpace.java is failing

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12397/files
  - new: https://git.openjdk.org/jdk/pull/12397/files/42ad4cea..114857c1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12397&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12397&range=01-02

  Stats: 75244 lines in 1898 files changed: 35620 ins; 19510 del; 20114 mod
  Patch: https://git.openjdk.org/jdk/pull/12397.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12397/head:pull/12397

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