RFR: 7903191: Fix build with "MAKEFLAGS=-j32". [v2]

[Jan Kratochvil]

On Mon, 16 May 2022 21:23:17 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Jan Kratochvil has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
>> 
>>   Fix build with "MAKEFLAGS=-j32".
>>   
>>   /bin/sh: line 5: jtreg/build/classes/com/sun/javatest/regtest/tool/jars.properties: No such file or directory
>>   make: *** [jtreg.gmk:98: jtreg/build/classes/com/sun/javatest/regtest/tool/jars.properties] Error 1
>
> This would be better/simpler as just `$(MKDIR) -p $(@D)`

@jonathan-gibbons Hello, is there anything more I should do to get the patch approved? Thanks.

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PR: https://git.openjdk.org/jtreg/pull/72