Fix zlib_installed not using the correct flags
#99
| Job | Run time |
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| 5m 59s | |
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| 2m 59s | |
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| 3m 47s | |
| 3m 1s | |
| 3m 11s | |
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| 3m 7s | |
| 4m 5s | |
| 1m 35s | |
| 1m 36s | |
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| 1m 35s | |
| 1m 36s | |
| 1m 44s | |
| 1m 31s | |
| 1m 50s | |
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| 1m 37s | |
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| 1m 46s | |
| 1m 46s | |
| 1m 36s | |
| 1m 58s | |
| 1m 37s | |
| 1m 58s | |
| 1m 43s | |
| 2h 11m 0s |