build.res: allow dir="-" when requesting resources with subsignals.
#3516
| Job | Run time |
|---|---|
| 50s | |
| 49s | |
| 41s | |
| 2m 15s | |
| 44s | |
| 2m 15s | |
| 39s | |
| 2m 12s | |
| 2m 44s | |
| 3m 25s | |
| 4m 53s | |
| 4m 48s | |
| 4m 47s | |
| 3m 6s | |
| 15s | |
| 0s | |
| 1s | |
| 13s | |
| 37s | |
| 0s | |
| 35m 14s |