[jdk17] RFR: 8259848: Interim javadoc build does not support platform links

[Erik Joelsson]

On Wed, 7 Jul 2021 19:02:04 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> This patch adds copying of element-list files generated for jdk.javadoc to the interim langtools version of jdk.javadoc. I'm also refactoring the jdk.javadoc/Gendata.gmk file a bit to better adhere to current build infra standards as this was missed in the original review of this file. Rebuilding should now work better with the various clean targets and any problems with the generation tool will be captured in separate log files, along with the command lines.
> 
> @hns Can you verify that this solves the problem you reported?

For some reason the build label wasn't added automatically, so looking for a build-dev review too.

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PR: https://git.openjdk.java.net/jdk17/pull/227