build.res: allow dir="-" when requesting resources with subsignals. [0.5 backport]
#3511
| Job | Run time |
|---|---|
| 31s | |
| 36s | |
| 43s | |
| 46s | |
| 41s | |
| 1s | |
| 1s | |
| 25s | |
| 1s | |
| 1s | |
| 1s | |
| 1s | |
| 1s | |
| 1s | |
| 1s | |
| 7s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 3m 58s |