[jdk18u] RFR: 8282444: Module finder incorrectly assumes default file system path-separator character

[Chris Hegarty]

8282444: Module finder incorrectly assumes default file system path-separator character

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Commit messages:
 - Backport 369291b265e13d625c5f465da9b1854c0d70c435

Changes: https://git.openjdk.java.net/jdk18u/pull/48/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=48&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282444
  Stats: 10 lines in 5 files changed: 2 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/48.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/48/head:pull/48

PR: https://git.openjdk.java.net/jdk18u/pull/48