* gnu/system/privilege.scm (file-like->setuid-program): New public
procedure.
* gnu/system/setuid.scm: Re-export it for compatibility.
(file-like->setuid-program): Remove this old version.
* gnu/services/docker.scm (singularity-setuid-programs): Use it (again).
* gnu/services/desktop.scm (enlightenment-privileged-programs): Likewise.

Change-Id: I8e41144438677a15cdadb3063651dbc780715497

* gnu/system/setuid.scm (setuid-program): Rewrite as syntax to create a
<privileged-program> record that is setuid by default.
(setuid-program?, setuid-program-program, setuid-program-setuid?)
(setuid-program-setgid?, setuid-program-user, setuid-program-group):
Alias their privileged-program equivalent.

I flubbed and somehow when including the patch series, this got dropped.
Oops... should fix things again.

* gnu/system/setuid.scm: New file.