Added --depth 1 flag for cloning external libraries (thanks @gxost!)
#956
| Job | Run time |
|---|---|
| 2m 45s | |
| 4m 2s | |
| 2m 0s | |
| 1m 28s | |
| 1m 45s | |
| 1m 37s | |
| 1m 13s | |
| 1m 41s | |
| 16m 31s |