bug#52909: Some man pages are not built correctly

[Leo Famulari]

On Guix Git commit c7d74a9bccfc1b1274fc8754a6e78bb6887c7fea, at least
some manpages are not being built correctly for packages such as elogind
and gnome-keyring-daemon. Are we seeing raw groff input? I'm not sure of
the technology used here.