RFR: 7256: Use .jcheck/conf property to control version [v2]

[Guru Hb]

On Thu, 13 May 2021 02:41:08 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> See Erik Joelsson's comment in https://bugs.openjdk.java.net/browse/SKARA-1033.
>
> Marcus Hirt has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.

Marked as reviewed by ghb (Reviewer).

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PR: https://git.openjdk.java.net/jmc/pull/249