There's a merged pull request on the void-packages repository

shutils/pkgtarget: speed up build dir cleanup.
https://github.com/void-linux/void-packages/pull/30788

Description:
We need `chmod -R` to be able to cleanup after Go packages, but it's
unnecessary in most other cases. By only running it when the first `rm
-rf` fails, we optimize for the most common case and get a tiny speedup
for this build step.

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#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [ ] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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