New issue by unspecd on void-packages repository

https://github.com/void-linux/void-packages/issues/28061

Description:
<!-- Don't request update of package. We have a script for that. https://alpha.de.repo.voidlinux.org/void-updates/void-updates.txt . However, a quality pull request may help. -->
### System

* xuname:  
  *Void 5.10.8_1 x86_64-musl GenuineIntel uptodate rrrnFFFFFFFFF*

### Expected behavior

`sudo xbps-install -Su` runs successfully.

### Actual behavior

Since today's update:
```sh
$ sudo xbps-install -Suy
MISSING: libstdc++-10.2.1pre1_1
Transaction aborted due to unresolved dependencies.
```