RFR: 8296805: ctw build is broken

[Roland Westrelin]

On Thu, 10 Nov 2022 19:34:46 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> I noticed the build for the ctw tool based on the WhiteBox API is
>> broken. This fixes it AFAICT.
>
> I verified that our testing does not use this Makefile.
> I run `make` locally as you did and it passed with this fix.
> I consider it is trivial.

Thanks @vnkozlov @TobiHartmann for the reviews

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PR: https://git.openjdk.org/jdk/pull/11090