[bug #56701] Do not allow -j without a number

[INVALID.NOREPLY]

Follow-up Comment #6, bug #56701 (project make):

For some reason I always assumed -j without an argument was equivalent to -j
$(nproc).

It certainly can't be made illegal without breaking compatibility with
existing systems that execute make.

Making it equivalent to any number other than unlimited *could* break
compatibility if there is some script out there which relies on infinite
parallel jobs to avoid a deadlock. -l is likely to avoid this since deadlocked
jobs will not contribute to system load.

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