Add #[repr(C)] on a few remaining blst types
#142
| Job | Run time |
|---|---|
| 44s | |
| 10m 51s | |
| 13m 16s | |
| 14m 11s | |
| 11m 49s | |
| 18m 46s | |
| 4m 4s | |
| 4m 47s | |
| 4m 41s | |
| 4m 4s | |
| 7m 49s | |
| 5m 22s | |
| 5m 51s | |
| 5m 13s | |
| 5m 46s | |
| 9m 59s | |
| 2h 7m 13s |