RFR: 7903793: Latent typo in ReportOnlyTest.gmk [v2]

[Iris Clark]

On Tue, 20 Aug 2024 18:51:46 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Please review a test-only fix for a mistake in `ReportOnlyTest.gmk`.
>> 
>> The report directory previously had a double prefix of the value of `$(BUILDTESTDIR)`
>
> Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:
> 
>   address review feedback

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jtreg/pull/222#pullrequestreview-2248911672