RFR: 7903191: Fix build with "MAKEFLAGS=-j32". [v4]

[Jan Kratochvil]

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

>> Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
>> 
>>   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