dbus: Enable AppArmor mediation support

pkgs/development/libraries/dbus/make-session-conf.xsl

@@ -15,12 +15,16 @@
   <xsl:output method='xml' encoding="UTF-8" doctype-system="busconfig.dtd" />
 
   <xsl:param name="serviceDirectories" />
+  <xsl:param name="apparmor" />
 
   <xsl:template match="/busconfig">
     <busconfig>
       <!-- We leave <standard_session_servicedirs/> because it includes XDG dirs and therefore user Nix profile. -->
       <xsl:copy-of select="child::node()[name() != 'include' and name() != 'servicedir' and name() != 'includedir']" />
 
+      <!-- configure AppArmor -->
+      <apparmor mode="{$apparmor}"/>
+
       <xsl:for-each select="str:tokenize($serviceDirectories)">
         <servicedir><xsl:value-of select="." />/share/dbus-1/services</servicedir>
         <includedir><xsl:value-of select="." />/etc/dbus-1/session.d</includedir>