Added DDD and LLDB to the start shell script

gtk2_ardour/ardour.sh.in

@@ -61,8 +61,10 @@ export VAMP_PATH=@LIBDIR@/vamp${VAMP_PATH:+:$VAMP_PATH}
 
 if [ $# -gt 0 ] ; then
     case $1 in
-        -g|--gdb) GDB=gdb; shift ;;
+        --ddd)    DEBUGGER=ddd; shift ;;
+        -g|--gdb) DEBUGGER=gdb; shift ;;
+        --lldb)   DEBUGGER=lldb; shift ;;
     esac
 fi
 
-exec $GDB @LIBDIR@/ardour-@VERSION@ "$@"
+exec $DEBUGGER @LIBDIR@/ardour-@VERSION@ "$@"