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='2022-07-31 21:55:48 -0400'>2022-07-31</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=eef8e2ec46c4155980815e00a394428c0c3de075'>gnu: qttools: Rename to qttools-5.</a><span class='msg-avail'>...<span class='msg-tooltip'>Automated with:

  git grep -l qttools | xargs sed 's/\bqttools\b/\0-5/g' -i
  git checkout NEWS
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-05-31 14:54:12 -0400'>2022-05-31</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=4a0e996ada9cd76e302d7f97446513cea1391c09'>gnu: pdf2djvu: Disable tests to avoid Python 2 dependencies.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/djvu.scm (pdf2djvu)[tests]: Set to #f.
[test-target]: Delete argument.
[native-inputs]: Use new style.  Delete python-2 and python2-nose.
[inputs]: Use new style.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-05-31 14:53:59 -0400'>2022-05-31</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=89f9678126e7dbcd3b1f96694fdf96778d9b5979'>gnu: didjvu: Switch to a Python 3 compatible fork.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/djvu.scm (didjvu)[source]: Switch to a Python 3 compatible
fork.
[native-inputs, inputs]: Move below arguments field.  Use new style.  Replace
the Python 2 inputs by their Python 3 equivalents.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-05-31 14:52:26 -0400'>2022-05-31</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=d9e54dfd4c60791b923ae309e1fb0ac635502c01'>gnu: Remove djvusmooth.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/djvu.scm (djvusmooth): Delete variable.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-05-31 14:52:24 -0400'>2022-05-31</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=1db80805914347ca964c1357fa0e38665ea4bddb'>gnu: ocrodjvu: Use a Python 3 compatible fork.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/djvu.scm (ocrodjvu)[source]: Update URL to Python 3 fork.
[inputs]: Use new style.  Remove python2-subprocess32.  Replace all other
Python 2 inputs by their Python 3 equivalent.  Add python-future and
python-regex.
[arguments]: Use gexps, and adjust accordingly, using this-package-input and
search-input-file.
</span></span></td><td>Maxim Cournoyer</td></tr>