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='2019-01-16 16:08:22 +0100'>2019-01-16</span></td><td><a href='/guix/commit/gnu/packages/apl.scm?id=cd0322a3efd96577de9ab35e4432d1ae399257c8'>gnu: Move sqlite to separate module.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/databases.scm (sqlite, sqlite-3.26.0, sqlite-with-fts5,
sqlite-with-column-metadata): Move variables from here...
* gnu/packages/sqlite.scm: ...to this new module.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* gnu/packages/apl.scm,
gnu/packages/bittorrent.scm,
gnu/packages/calendar.scm,
gnu/packages/code.scm,
gnu/packages/crypto.scm,
gnu/packages/databases.scm,
gnu/packages/dc.scm,
gnu/packages/disk.scm,
gnu/packages/ebook.scm,
gnu/packages/education.scm,
gnu/packages/emacs.scm,
gnu/packages/emulators.scm,
gnu/packages/file-systems.scm,
gnu/packages/freedesktop.scm,
gnu/packages/ftp.scm,
gnu/packages/games.scm,
gnu/packages/geo.scm,
gnu/packages/gnome.scm,
gnu/packages/gnunet.scm,
gnu/packages/gnupg.scm,
gnu/packages/gnuzilla.scm,
gnu/packages/gps.scm,
gnu/packages/guile.scm,
gnu/packages/ibus.scm,
gnu/packages/kerberos.scm,
gnu/packages/kodi.scm,
gnu/packages/lisp.scm,
gnu/packages/mail.scm,
gnu/packages/messaging.scm,
gnu/packages/mpd.scm,
gnu/packages/music.scm,
gnu/packages/networking.scm,
gnu/packages/nfs.scm,
gnu/packages/ocaml.scm,
gnu/packages/package-management.scm,
gnu/packages/pdf.scm,
gnu/packages/photo.scm,
gnu/packages/php.scm,
gnu/packages/python.scm,
gnu/packages/qt.scm,
gnu/packages/ruby.scm,
gnu/packages/scheme.scm,
gnu/packages/sync.scm,
gnu/packages/syndication.scm,
gnu/packages/version-control.scm,
gnu/packages/video.scm,
gnu/packages/web-browsers.scm,
gnu/packages/webkit.scm: Adjust module references.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-03-18 21:28:20 +0200'>2017-03-18</span></td><td><a href='/guix/commit/gnu/packages/apl.scm?id=eba72e1716ca3efb5c2c416b6c2c8303cfef0d99'>gnu: apl: Update to 1.7.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/apl.scm (apl): Update to 1.7.
[home-page]: Use https.
</span></span></td><td>Efraim Flashner</td></tr>