units: drop full paths for utilities in $PATH

This makes things a bit simpler and the build a bit faster, because we don't
have to rewrite files to do the trivial substitution. @rootbindir@ is always in
our internal $PATH that we use for non-absolute paths, so there should be no
functional change.

units/systemd-tmpfiles-setup-dev.service

@@ -0,0 +1,22 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Create Static Device Nodes in /dev
+Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
+DefaultDependencies=no
+Conflicts=shutdown.target
+After=systemd-sysusers.service
+Before=sysinit.target local-fs-pre.target systemd-udevd.service shutdown.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=systemd-tmpfiles --prefix=/dev --create --boot
+SuccessExitStatus=DATAERR CANTCREAT