New review comment by icp1994 on void-packages repository

https://github.com/void-linux/void-packages/pull/43235#discussion_r1156131757

Comment:
```suggestion
post_build() {
	cargo auditable build --release --target ${RUST_TARGET} --package xtask
	vtargetrun target/${RUST_TARGET}/release/xtask generate-shell-completion
	vtargetrun target/${RUST_TARGET}/release/xtask generate-manpage
}

```