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='2023-08-13 02:00:00 +0200'>2023-08-13</span></td><td><a href='/guix/commit/gnu/packages/noweb.scm?id=709232459d47db6fec4e3460ebf418f70379ef61'>gnu: noweb: Update to 2.13.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/noweb.scm (noweb): Update to 2.13.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-08-13 02:00:00 +0200'>2023-08-13</span></td><td><a href='/guix/commit/gnu/packages/noweb.scm?id=74f707d76d8b50cdcbfda6aeab4e79cf6337ef10'>gnu: noweb: Use G-expressions.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/noweb.scm (noweb)[arguments]:
Rewrite as G-expressions.  Don't explicitly return #t from phases.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/noweb.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>This commit was obtained by running:

  ./pre-inst-env guix style

without any additional argument.
</span></span></td><td>Ludovic Courtès</td></tr>