RFR: 8275745: Reproducible copyright headers [v3]

[Magnus Ihse Bursie]

On Thu, 11 Nov 2021 21:34:58 GMT, Emmanuel Bourg <duke at openjdk.java.net> wrote:

>> Emmanuel Bourg 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. The pull request contains two additional commits since the last revision:
>> 
>>  - Make gensrc code use $COPYRIGHT_YEAR
>>  - Set COPYRIGHT_YEAR from SOURCE_DATE_EPOCH if present
>
> Thank you for the advice, I'm not familiar with the Skara workflow yet.

@ebourg To finish integrating this PR, you need to type `/integrate` as a PR comment. This will allow the Skara bots to move the bug on to the state where I can sponsor it.

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PR: https://git.openjdk.java.net/jdk/pull/1498