New issue by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/issues/35223

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 5.15.14_1 x86_64 AuthenticAMD notuptodate rrFFFFFFFFFFFFFFF

### Expected behavior

```
$ XBPS_MAKEJOBS=12345 ./xbps-src show-var XBPS_MAKEJOBS
12345
```
or
```
$ export XBPS_MAKEJOBS=12345
$ ./xbps-src show-var XBPS_MAKEJOBS
12345
```

### Actual behavior

```
$ XBPS_MAKEJOBS=12345 ./xbps-src show-var XBPS_MAKEJOBS
# takes value from etc/conf
12
```
or
```
$ export XBPS_MAKEJOBS=12345
$ ./xbps-src show-var XBPS_MAKEJOBS
# takes value from etc/conf
12
```

### Steps to reproduce the behavior

see above.