Closed issue by basiliscos on void-packages repository

https://github.com/void-linux/void-packages/issues/14811

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:  

```
xuname
CONFLICT: llvm8-8.0.1_1 with llvm9-9.0.0_1 in transaction (matched by llvm9>=0)
Transaction aborted due to conflicting packages.
Void 5.2.17_1 x86_64 GenuineIntel uptodate rrrmFFFFF
```

* package:  

`llvm`

### Expected behavior

update packages via `xbps-install -Su`