New comment by tavianator on void-packages repository

https://github.com/void-linux/void-packages/pull/29437#issuecomment-804393224

Comment:
The builds seem to be in an infinite loop of trying and failing to drop capabilities.  I'm guessing this is because the tests don't have `CAP_SETPCAP`, and I overlooked that `capsh --drop` needs it:

```
       --drop=cap-list
              Remove the listed capabilities from the prevailing
              bounding set. The capabilities are a comma-separated list
              of capabilities as recognized by the cap_from_name(3)
              function. Use of this feature requires that capsh is
              operating with CAP_SETPCAP in its effective set.
```

I'll try to fix it.