Install a temporary copy of rpm-ostree for unprivileged use

Install a copy of rpm-ostree as rpm-ostree-unpriv to get a `bin_t`
labeled binary as a temporary workaround for:
https://bugzilla.redhat.com/show_bug.cgi?id=1937404

Also modify the rpm-ostree count me service to use that binary.

Makefile-rpm-ostree.am

@@ -149,6 +149,7 @@ BUILT_SOURCES += $(binding_generated_sources)
 install-rpmostree-hook:
 	install -d -m 0755 $(DESTDIR)$(bindir)
 	install -m 0755 -t $(DESTDIR)$(bindir) rpm-ostree
+	install -m 0755 rpm-ostree $(DESTDIR)$(libexecdir)/rpm-ostree-unpriv
 INSTALL_EXEC_HOOKS += install-rpmostree-hook
 
 # Wraps `cargo test`.  This is always a debug non-release build;

src/daemon/rpm-ostree-countme.service.in

@@ -9,4 +9,4 @@ User=rpm-ostree
 DynamicUser=yes
 StateDirectory=rpm-ostree-countme
 StateDirectoryMode=750
-ExecStart=@bindir@/rpm-ostree countme
+ExecStart=@libexecdir@/rpm-ostree-unpriv countme