[crac] RFR: More robust classpath parsing [v2]

[Radim Vansa]

> On Windows, path with forward slashes starting with `/` is an accepted classpath element, even though it might seem as invalid and parsing in `Path.of(...)` would fail.

Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:

  Use File() ctor instead of custom parsing

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Changes:
  - all: https://git.openjdk.org/crac/pull/140/files
  - new: https://git.openjdk.org/crac/pull/140/files/2f61a9e8..77b3e873

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=140&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=140&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.org/crac/pull/140.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/140/head:pull/140

PR: https://git.openjdk.org/crac/pull/140