RFR: 8349092: File.getFreeSpace violates specification if quotas are in effect (win)

[Brian Burkhalter]

On Windows, for `File.getFreeSpace` return the same value as returned by `File.getUsableSpace`.

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Commit messages:
 - 8349092: File.getFreeSpace violates specification if quotas are in effect (win)

Changes: https://git.openjdk.org/jdk/pull/23377/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23377&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349092
  Stats: 16 lines in 2 files changed: 13 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/23377.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23377/head:pull/23377

PR: https://git.openjdk.org/jdk/pull/23377