New review comment by desertsagebrush on void-packages repository

https://github.com/void-linux/void-packages/pull/47870#discussion_r1436158467

Comment:
Part of the problem is that there are few diagnostics coming out of `vtargetrun`; whenever there is an error (other than an error with args for qemu) it just pops up:
```
=> i3status-rust-0.32.3_1: running post_build ...
    Finished release [optimized] target(s) in 0.09s
=> ERROR: i3status-rust-0.32.3_1: post_build: '"/usr/bin/qemu-${XBPS_TARGET_QEMU_MACHINE}-static" "$@"' exited with 1
=> ERROR:   in vtargetrun() at common/build-helper/qemu.sh:10
=> ERROR:   in post_build() at srcpkgs/i3status-rust/template:20
```
While I can manually poke the generated binary (and the command line I'm passing to it) for x86_64, the lack of diagnostics means that trying to make sure everything works for cross-compiling is a bit more challenging.