alsa: Add elogind/systemd as alsa-lib recommended runtime dependency ...

and no longer add users into audio group.

Suggested-by: Thanos Baloukas <baloukasthan@gmail.com>

multimedia/libdriv/alsa-lib.xml

@@ -70,6 +70,21 @@
 
     <bridgehead renderas="sect3">ALSA Library Dependencies</bridgehead>
 
+    <bridgehead renderas="sect4">Recommended (Runtime)</bridgehead>
+    <para role="runtime">
+      <phrase revision='sysv'><xref linkend='elogind'/></phrase>
+      <phrase revision='systemd'><xref linkend='systemd'/></phrase>
+    </para>
+
+    <note>
+      <para>
+        If the recommended runtime dependency is not installed, you may
+        need to run any application requiring ALSA library as the &root;
+        user or a user in the
+        <systemitem class='groupname'>audio</systemitem> group.
+      </para>
+    </note>
+
     <bridgehead renderas="sect4">Optional</bridgehead>
     <para role="optional">
       <xref linkend="doxygen"/>,

multimedia/libdriv/alsa-utils.xml

@@ -184,7 +184,7 @@ make</userinput></screen>
         <application>Udev</application> when the device is detected
         (during boot or when plugged in for USB devices).
       </para>
-
+<!-- not needed with elogind or systemd-logind
       <para>
         All sound devices are not accessible for any user except
         <systemitem class="username">root</systemitem> and members of the
@@ -201,7 +201,7 @@ make</userinput></screen>
           should work as well.
         </para>
       </note>
-
+-->
       <para>
         On systems which have multiple sound cards, you may need to adjust the
         default audio device so that you can get output from your speakers.