New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/38537#discussion_r940536933

Comment:
This weird trailing space behavior is likely to fail if somebody modifies `$OPTS` in `conf`. Better to do
```sh
OPTS="${OPTS} --logdir=$LOGDIR"
```
Even if `$OPTS` is empty, there's no harm in a leading space.