Allow parallel compilation of serde and serde_derive
#1062
| Job | Run time |
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| 17s | |
| 32s | |
| 3s | |
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| 16s | |
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| 19s | |
| 1m 0s | |
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| 46s | |
| 1m 4s | |
| 1m 15s | |
| 2m 36s | |
| 1m 10s | |
| 1m 1s | |
| 40s | |
| 30s | |
| 22s | |
| 45s | |
| 40s | |
| 1m 8s | |
| 17s | |
| 23s | |
| 30s | |
| 13m 53s | |
| 5m 16s | |
| 5m 40s | |
| 5m 15s | |
| 5m 15s | |
| 55m 6s |