[crac] RFR: 8347350: [CRaC] Support JRT FS FD

[Timofei Pushkin]

Fixes CRaC code in `jdk.internal.jimage.BasicImageReader` which was throwing exceptions when trying to use CRaC API from another module.

-------------

Commit messages:
 - Remove extra whitespaces
 - jdk/crac/fileDescriptors/JrtFsTest.java test fails on all windows
 - Support JRT FS FD in Crac

Changes: https://git.openjdk.org/crac/pull/177/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=177&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347350
  Stats: 297 lines in 3 files changed: 254 ins; 6 del; 37 mod
  Patch: https://git.openjdk.org/crac/pull/177.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/177/head:pull/177

PR: https://git.openjdk.org/crac/pull/177