RFR: 8339335: set number of parallel jobs when building webkit [v2]

[Kevin Rushforth]

On Tue, 3 Sep 2024 19:56:48 GMT, Johan Vos <jvos at openjdk.org> wrote:

>> When building webkit, the perl script in `modules/javafx.web/src/main/native/Tools/Scripts/build-webkit` will check for a `-j` argument in `$makeArgs`. If that doesn't exist, it will default to `numberOfCPUs()`.
>> This PR passes the `NUM_COMPILE_THREADS` from `build.gradle` to the `build-webkit` script. When not setting `NUM_COMPILE_THREADS` explicitly,it will default to the number of CPU's as well, hence it will have the same behavior as without this PR.
>> When setting `NUM_COMPILE_THREADS` explicitly, the provided number will be used by cmake as well now.
>
> Johan Vos has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove the special case where native compile jobs are hard set to 1
>   on Mac -- see JDK-8339505

All good.

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Marked as reviewed by kcr (Lead).

PR Review: https://git.openjdk.org/jfx/pull/1554#pullrequestreview-2279821394