New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/41753#discussion_r1083328594

Comment:
Maybe we should encode the revision in the version string as `r1`, then it more directly relates to the original download package and we can drop `_revision` in favor of a substitution in `distfiles` below:
```suggestion
version=2.3.7r1
```