New review comment by not-chicken on void-packages repository

https://github.com/void-linux/void-packages/pull/26862#discussion_r533882659

Comment:
> Why is the `qemu` build helper required? I see nothing running in under emulation in this template.

Without it the cross builds were failing with:
```
Cannot use target appstreamcli as a generator because it is built for the
host machine and no exe wrapper is defined or needs_exe_wrapper is
true. You might want to set `native: true` instead to build it for
the build machine.
```