[crac] RFR: Improved classpath matching

[Radim Vansa]

This fixes an issue when the classpath entry is specified using a relative path, and another part of the application opens the file using absolute one (or vice versa) - e.g. using a custom classloader that does not use PersistentJarFile underneath.

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Commit messages:
 - Improved classpath matching

Changes: https://git.openjdk.org/crac/pull/118/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=118&range=00
  Stats: 62 lines in 2 files changed: 54 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/crac/pull/118.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/118/head:pull/118

PR: https://git.openjdk.org/crac/pull/118