New review comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/26035#discussion_r515561249

Comment:
I would try to avoid nested `if .. then ..fi`
I guess something like:
```sh
if [ -z "$CHROOT_READY" ]; then
	hostmakedepends="cmake-bootstrap"
	unset XBPS_CHECK_PKGS
else
	hostmakedepends="asciidoc cmake perl"
fi

if [ -n "$XBPS_CHECK_PKGS" ]; then
	configure_args+=" -DENABLE_TESTING=ON"
else
	configure_args+=" -DENABLE_TESTING=OFF"
fi
```

The `unset` is also used in `binutils`.

I'll try a full bootstrap later.