RFR: 8298038: [s390] Configure script detects num_cores +1

[Amit Kumar]

On Wed, 14 Dec 2022 04:29:06 GMT, Amit Kumar <duke at openjdk.org> wrote:

> cpuinfo on s390x architecture contains additional header information on Linux/Z which is not seen on GNU Linux:
> 
> 
> vendor_id       : IBM/S390
> # processors    : 8
> 
> due to this one extra build job is created. 
> 
> Reported Issue can be found here : [JDK-8298038](https://bugs.openjdk.org/browse/JDK-8298038)

Waiting for OCA approval.

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PR: https://git.openjdk.org/jdk/pull/11659