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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<tr><td><span title='2020-04-19 09:06:20 +0300'>2020-04-19</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=fafe2343c29bcb02fcee79558fbd8ae2ba2c1214'>services: sddm: Have sddm provision xorg-server.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-03-01 14:13:27 +0100'>2020-03-01</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=50be0da7bfd5c108697679effeb2a893d2f37598'>services: set-xorg-configuration: handle slim and sddm</a><span class='msg-avail'>...</span></td><td>Jakub Kądziołka</td></tr>
<tr><td><span title='2020-02-16 09:25:00 +0200'>2020-02-16</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=3c6aca4232d1a3638ec962bc7afe9121626c43ec'>doc: Fix typo.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2019-10-21 18:16:16 +0200'>2019-10-21</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=cfe8d8063b5d79fc91eb757c2020244e239b77b3'>services: sddm: Add description.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-10-21 18:16:16 +0200'>2019-10-21</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=8cf3e167c15a0dba3166cbeee46d41f26cbf75f1'>services: sddm: Deprecate 'sddm-service' procedure.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-10-21 18:16:16 +0200'>2019-10-21</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=5ac5f2c1298cac811a544e2db193ba5d69d9fce6'>services: sddm: Add default configuration.</a><span class='msg-avail'>...</span></td><td>Brendan Tildesley</td></tr>
<tr><td><span title='2019-05-26 01:34:16 +0200'>2019-05-26</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=ed90104cc82fdd6b762a159b06c0ea37b417a9a5'>services: sddm: Fix root login failure issue.</a><span class='msg-avail'>...</span></td><td>Reza Alizadeh Majd</td></tr>
<tr><td><span title='2019-04-11 05:42:41 +0200'>2019-04-11</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=02394462fcddd4fdaf354178160adc54c47de1bc'>services: sddm: Switch back to using ‘startx’.</a><span class='msg-avail'>...</span></td><td>frozenpigs</td></tr>
<tr><td><span title='2019-03-25 19:24:22 +0100'>2019-03-25</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=b283d5f6308154b42a8656f370c97168726b2ab5'>services: SDDM: Specify absolute path to the X server.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-03-24 23:06:11 +0100'>2019-03-24</span></td><td><a href='/guix/commit/gnu/services/sddm.scm?id=554b8607396785dcde6eb391f75f98a07ec582fd'>services: sddm, slim, gdm: Take an &lt;xorg-configuration&gt; record.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>