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='2021-08-04 15:44:09 +0200'>2021-08-04</span></td><td><a href='/guix/commit/gnu/packages/patches/instead-use-games-path.patch?id=2e0ddc74f6641ec1e286f7f81eaf5bf6644eed52'>gnu: Add instead.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/game-development.scm (instead): New variable.
* gnu/packages/patches/instead-use-games-path.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it here.
</span></span></td><td>Dmitry Polyakov</td></tr>