[crac] RFR: 8346765: [CRaC] Could not find criuengine on Windows and Mac

[Timofei Pushkin]

Sets `simengine` as the default `CREngine` on Windows and Mac since `criuengine` (the previous default) does not exist there.

Also adds the corresponding test.

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Commit messages:
 - 8346765: Could not find criuengine on Windows and Mac

Changes: https://git.openjdk.org/crac/pull/166/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=166&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346765
  Stats: 68 lines in 7 files changed: 63 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/crac/pull/166.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/166/head:pull/166

PR: https://git.openjdk.org/crac/pull/166