RFR: 7902766: Idempotent builds

[Dmitry Bessonov]

On Wed, 16 Sep 2020 00:01:43 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> 7902766: Idempotent builds
> In aid of idempotent builds ...
> 
> Replace `<delete>` before `<javac>` with `<depend>`
> Remove `<delete>` before copying help files
> 
> For now the <delete> tasks are just commented out. If you agree, they can be removed.

Thank you very much for improving this aspect of the JTH build procedure!

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Marked as reviewed by dbessono (Committer).

PR: https://git.openjdk.java.net/jtharness/pull/6