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='2018-11-12 23:37:13 +0100'>2018-11-12</span></td><td><a href='/guix/commit/tests/size.scm?id=9ed86fe175c15c819d6d86681c8136ff6bc927c0'>tests: Add 'test-assertm' to (guix tests).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-04-07 00:17:16 +0200'>2017-04-07</span></td><td><a href='/guix/commit/tests/size.scm?id=c923f831160ddbda21d8ea1f2df4670550f3e9d8'>size: Add test to multiple 'store-profile' arguments.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-05-24 23:05:28 +0200'>2016-05-24</span></td><td><a href='/guix/commit/tests/size.scm?id=a371aa225c2fb0a7071609d10bbddbef353a0da5'>size: 'store-profile' takes a list of store items.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>