[crac] RFR: Adapted some FileDescriptor tests for Win [v6]

[Roman Marchenko]

> Made changes regarding FileDescriptor for Win platform, adapted some tests.

Roman Marchenko has updated the pull request incrementally with one additional commit since the last revision:

  Fixing review comments

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Changes:
  - all: https://git.openjdk.org/crac/pull/91/files
  - new: https://git.openjdk.org/crac/pull/91/files/69680030..4a6f79ca

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=91&range=05
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=91&range=04-05

  Stats: 4 lines in 1 file changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/crac/pull/91.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/91/head:pull/91

PR: https://git.openjdk.org/crac/pull/91