Passes the `Charset` read from the `stdin.encoding` system property while creating `InputStreamReader` or `Scanner` instances for `System.in`.
`stdin.encoding` is a recently added property for Java 25 in [JDK-8350703](https://bugs.openjdk.org/browse/JDK-8350703). Employing it throughout the entire code base is addressed by the parent ticket [JDK-8356893](https://bugs.openjdk.org/browse/JDK-8356893). JDK-8357993 this PR is addressing is a sub-task of JDK-8356893 and is concerned with only areas related to Hotspot. ------------- Commit messages: - Remove redundant assert - Discard changes unrelated with build and tools - Revert superfluous changes - Revert changes to 3rd parties in `com/sun/org/apache` - Revert `PandocFilter` changes - Use `stdin.encoding` in `InputStreamReader` and `Scanner` instantiations Changes: https://git.openjdk.org/jdk/pull/25542/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25542&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8357993 Stats: 13 lines in 4 files changed: 4 ins; 0 del; 9 mod Patch: https://git.openjdk.org/jdk/pull/25542.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/25542/head:pull/25542 PR: https://git.openjdk.org/jdk/pull/25542
