build.res: allow dir="-" when requesting resources with subsignals. [0.5 backport]
#3512
| Job | Run time |
|---|---|
| 44s | |
| 48s | |
| 37s | |
| 2m 24s | |
| 44s | |
| 2m 26s | |
| 40s | |
| 2m 30s | |
| 3m 2s | |
| 3m 27s | |
| 5m 10s | |
| 4m 57s | |
| 4m 52s | |
| 3m 37s | |
| 6s | |
| 0s | |
| 1s | |
| 8s | |
| 32s | |
| 0s | |
| 36m 45s |