RFR: JDK-8289741 : Remove unused imports from DTDBuilder.java [v2]

[ScientificWare]

On Fri, 5 Aug 2022 07:56:40 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

>> Just waiting to be reviewed.
>
> Hello @scientificware, what you propose here, I think looks fine. Additionally can you also update the copyright years on this file from `Copyright (c) 1998, 2020,` to `Copyright (c) 1998, 2022,`?
> 
> I see that the changed file resides at `make/jdk/src/classes/build/tools/dtdbuilder/DTDBuilder.java` and I think this needs to be reviewed by the build team. @magicus, is it OK if I re-add the `build` label for this PR?

Hello @jaikiran, the copyright years were updated by a previous commit.

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PR: https://git.openjdk.org/jdk/pull/9360