The first crude version of tracing across libraries

- the patch will be sliced later
diff --git a/libltrace.c b/libltrace.c
index dcd5537..2295901 100644
--- a/libltrace.c
+++ b/libltrace.c
@@ -16,8 +16,8 @@
 
 int exiting = 0;		/* =1 if a SIGINT or SIGTERM has been received */
 
-static enum pcb_status
-stop_non_p_processes (Process * proc, void * data)
+static enum callback_status
+stop_non_p_processes(Process *proc, void *data)
 {
 	int stop = 1;
 
@@ -39,7 +39,7 @@
 		kill(proc->pid, SIGSTOP);
 	}
 
-	return pcb_cont;
+	return CBS_CONT;
 }
 
 static void