RFR: Update to JDK 16 [v2]

[Erik Joelsson]

On Wed, 14 Apr 2021 07:04:48 GMT, Erik Helin <ehelin at openjdk.org> wrote:

>> Hi all,
>> 
>> please review this patch that updates the JDK used for building and running Skara to JDK 16. As part of the update I had to remove `--illegal-access=deny` from Skara's module plugin and I also had use `LogRecord.getLongThreadId` instead of the (since JDK 16) deprecated method `LogRecord.getThreadId`.
>> 
>> Testing:
>> - [x] `make images` locally
>> - [x] `make test` locally
>> 
>> Thanks,
>> Erik
>
> Erik Helin has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/1114