As described in [JDK-8296329](https://bugs.openjdk.org/browse/JDK-8296329), previously, the jar validator compare the "version" to validate a multi-release jar. The "version" is a mix of the major and minor version fused into a single int, which might be a negative number with `--enable-preview` - this result in wrong comparison.
This PR fixes it by only comparing major versions. ------------- Commit messages: - 8296329: Only compare major versions in jar validator Changes: https://git.openjdk.org/jdk/pull/11153/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11153&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8296329 Stats: 118 lines in 3 files changed: 114 ins; 1 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/11153.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11153/head:pull/11153 PR: https://git.openjdk.org/jdk/pull/11153
