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

rpm: define sharedstatedir
https://github.com/void-linux/void-packages/pull/19333

Description:
solved at least part of https://github.com/void-linux/void-packages/issues/19321

```
$ xuname ; rpm --version ; rpm --eval '%{_sharedstatedir}'
Void 5.4.10_2 x86_64 GenuineIntel notuptodate rrdFFFF
RPM version 4.15.1
/var/lib
```