RFR: 8355954: File.delete removes read-only files (win) [v5]

[Brian Burkhalter]

> This change proposes to modify `java.io.File.delete()` so that regular files on Windows will not be deleted by default if their read-only attribute is set. A boolean-valued system compatibility property `jdk.io.File.deleteReadOnly` is defined to reinstate legacy behavior if desired.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8355954: Split deleteReadOnlyRegularFile into Unix and Windows versions

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24977/files
  - new: https://git.openjdk.org/jdk/pull/24977/files/352c54dd..fa2273ed

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24977&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24977&range=03-04

  Stats: 32 lines in 1 file changed: 14 ins; 5 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/24977.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24977/head:pull/24977

PR: https://git.openjdk.org/jdk/pull/24977