Correct JackSocketServerChannel.h

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@3544 0c269be4-1314-0410-8aa9-9f06e86f4224

posix/JackSocketServerChannel.h

@@ -28,6 +28,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 namespace Jack
 {
 
+class JackServer;
+
 /*!
 \brief JackServerChannel using sockets.
 */