ghc: Cap number of parallel jobs to 2 for s390x
Build fails with out-of-memory on Ubuntu's s390x builders. Setting `ggc-min-expand=10` doesn't solve this. For now, reduce number of parallel jobs.
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Build fails with out-of-memory on Ubuntu's s390x builders. Setting `ggc-min-expand=10` doesn't solve this. For now, reduce number of parallel jobs.
mentioned in commit 54890c93