New comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/32843#issuecomment-913830403

Comment:
You need `which` in `hostmakedepends`, the build is trying to run it for something.

Also, make the checks depend on whether xbps-src actually enables checks:
```sh
if [ "$XBPS_CHECK_PKGS" ]; then
	makedepends+=" check-devel"
else
	configure_args+=" --disable-check"
fi
```