Bug#1026962: openjfx: tries to build with -j64 on a host with 2 processors

[James Addison]

Source: openjfx
Followup-For: Bug #1026962

Could the following build-related scripting be something to do with it?

  - https://salsa.debian.org/java-team/openjfx/-/blob/debian/11.0.11+1-1.1/modules/javafx.web/src/main/native/Tools/Scripts/webkitdirs.pm#L494-499

  - https://salsa.debian.org/java-team/openjfx/-/blob/debian/11.0.11+1-1.1/modules/javafx.web/src/main/native/Tools/Scripts/build-webkit#L300-305

(perhaps something about the way that numberOfCPUs is being evaluated on s390x
hosts isn't matching the expectations of the build script)