New issue by twpayne on void-packages repository

https://github.com/void-linux/void-packages/issues/34343

Description:
### System

* xuname:  
  `Void 5.4.0-86-generic x86_64 GenuineIntel uptodate rFF`
* package:  
  `age-1.0.0_1`

### Expected behavior

`age --version` should print age's version number:

```console
# age --version
1.0.0
```

### Actual behavior

`age --version` prints `(devel)`:

```console
# age --version
(devel)
```

### Steps to reproduce the behavior

```console
$ docker run -it ghcr.io/void-linux/void-linux:20211130rc01-full-x86_64 /bin/sh
# xbps-install --sync --update --yes age
...
[*] Configuring unpacked packages
age-1.0.0_1: configuring ...
age-1.0.0_1: installed successfully.

1 downloaded, 1 installed, 0 updated, 1 configured, 0 removed.
# age --version
(devel)
```

### Explanation

age's version number needs to be set a build time by passing
```
-ldflags "-X main.Version=$VERSION"
```
to `go build`. For an example, see [age's own build GitHub Action](https://github.com/FiloSottile/age/blob/main/.github/workflows/build.yml#L34).