Fix test for unset PPC_NUM_THREADS environment variable
#2917
| Job | Run time |
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| 7s | |
| 2m 38s | |
| 3m 16s | |
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| 3m 25s | |
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| 1m 28s | |
| 2m 3s | |
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| 3m 47s | |
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| 1h 25m 48s |