Exit after the user's session has finished.  This works around slim's broken
PAM session handling (see
http://developer.berlios.de/bugs/?func=detailbug&bug_id=19102&group_id=2663).

Patch by Eelco Dolstra, from Nixpkgs.

--- slim-1.3.6/app.cpp	2013-10-15 11:02:55.629263422 +0200
+++ slim-1.3.6/app.cpp	2013-10-15 13:00:10.141210784 +0200
@@ -816,7 +822,7 @@
 	StopServer();
 	RemoveLock();
 	while (waitpid(-1, NULL, WNOHANG) > 0); /* Collects all dead childrens */
-	Run();
+	exit(OK_EXIT);
 }
 
 void App::KillAllClients(Bool top) {
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<div class='path'>path: <a href='/guix/log/?id=33e82ce84f3aad7165d313f37357cc6b7200aa68'>root</a>/<a href='/guix/log/gnu?id=33e82ce84f3aad7165d313f37357cc6b7200aa68'>gnu</a>/<a href='/guix/log/gnu/services?id=33e82ce84f3aad7165d313f37357cc6b7200aa68'>services</a>/<a href='/guix/log/gnu/services/dict.scm?id=33e82ce84f3aad7165d313f37357cc6b7200aa68'>dict.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/dict.scm?id=33e82ce84f3aad7165d313f37357cc6b7200aa68&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-11-18 15:44:39 +0100'>2022-11-18</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=8d9647d8a77a67013c48166561134d92b5224264'>services: Add Shepherd 'configuration' action to various services.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/avahi.scm (avahi-shepherd-service): Add 'actions' field.
* gnu/services/base.scm (nscd-actions): Add call to
'shepherd-configuration-action'.
* gnu/services/desktop.scm (upower-shepherd-service): Add 'actions'
field.
(elogind-shepherd-service): Likewise.
* gnu/services/dict.scm (dicod-shepherd-service): Likewise.
* gnu/services/networking.scm (openntpd-shepherd-service): Likewise.
(tor-shepherd-service): Likewise.
* gnu/services/ssh.scm (openssh-shepherd-service): Likewise.
* gnu/services/web.scm (nginx-shepherd-service): Likewise.
* gnu/services/xorg.scm (gdm-shepherd-service): Likewise.
* gnu/tests/base.scm (run-basic-test)["nscd configuration action"]: New
test.
* doc/guix.texi (Services): Document it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-05-02 17:57:30 +0200'>2022-05-02</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=2a37f174becbafd70591f6eb1d98493c5c1df0e2'>services: Make sure Shepherd destructors match constructors.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to b06ecc57515d4e3c8b2228e8142654e9a26ba6e1,
211fe3f66e6dfdaa64974931c458ab1d92afc182, and
fd57ce267c4083fe98242caa31075d2bd62903bf.

* gnu/services/base.scm (guix-publish-shepherd-service): Change 'stop'
method to use 'make-systemd-destructor' when 'make-systemd-constructor'
is used.
* gnu/services/dict.scm (dicod-shepherd-service): Change 'stop' method
to use 'make-inetd-destructor' when 'make-inetd-constructor' is used.
* gnu/services/messaging.scm (bitlbee-shepherd-service): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-05-01 21:30:35 +0200'>2022-05-01</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=fd57ce267c4083fe98242caa31075d2bd62903bf'>services: dicod: Use 'make-inetd-constructor'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/dict.scm (dicod-shepherd-service): Use
'make-inetd-constructor' in the 'start' method when available.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-05-01 21:30:35 +0200'>2022-05-01</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=002bcb7eb0513f56f321c37948653b8d7f0cadb0'>services: dicod: Rewrite using 'least-authority-wrapper'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/dict.scm (dicod-shepherd-service): Rewrite using
'least-authority-wrapper' plus 'make-forkexec-constructor' instead of
'make-forkexec-constructor/container'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-21 00:31:15 +0200'>2020-09-21</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=b864ddb6905a1c4e3a88a6e8214b58f42ff5bf19'>services: dicod: Reduce irony.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/dict.scm (dicod-service): Fix docstring typo.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-05-08 16:30:50 +0200'>2020-05-08</span></td><td><a href='/guix/commit/gnu/services/dict.scm?id=dd0804c67e99914eecc471fdb92f4220425a1cbc'>services: Add descriptions.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/dbus.scm (polkit-service-type)[description]: New field.
* gnu/services/dict.scm (dicod-service-type)[description]: New field.
* gnu/services/dns.scm (knot-service-type)[description]: New field.
* gnu/services/networking.scm (dhcpd-service-type)[description]: New field.
* gnu/services/shepherd.scm (shepherd-root-service-type)[description]:
New field.
* gnu/services/xorg.scm (slim-service-type)[description]: New field.
(screen-locker-service-type)[description]: New field.
* gnu/system/pam.scm (pam-root-service-type)[description]: New field.
* gnu/system/shadow.scm (account-service-type)[description]: New field.
</span></span></td><td>Ludovic Courtès</td></tr>