packit copr builds are broken

[jeckersb]

example from #353

+ make manpages
cargo xtask manpages
error: no such command: `xtask`

help: a command with a similar name exists: `test`

help: view all installed commands with `cargo --list`
help: find a package to install `xtask` with `cargo search cargo-xtask`
make: *** [Makefile:23: manpages] Error 101
error: Bad exit status from /var/tmp/rpm-tmp.lkVtBQ (%build)

RPM build errors:
    Bad exit status from /var/tmp/rpm-tmp.lkVtBQ (%build)
Finish: rpmbuild bcvk-0.19.0-1.fc44.src.rpm
Finish: build phase for bcvk-0.19.0-1.fc44.src.rpm

I can sucessfully do a fedpkg mockbuild on the f44 branch of bcvk dist-git, so probably something out of sync between the downstream and upstream specfiles.