fix(build-std): determining root crates by target spec std:bool
#1616
| Job | Run time |
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| 2m 1s | |
| 3m 23s | |
| 2m 2s | |
| 1m 57s | |
| 4s | |
| 2m 18s | |
| 3m 9s | |
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| 8s | |
| 14m 20s | |
| 9m 6s | |
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| 14m 13s | |
| 12m 56s | |
| 29m 2s | |
| 13m 29s | |
| 20m 22s | |
| 30m 23s | |
| 1s | |
| 2h 56m 17s |