presence_xml: remove unecessary include

- adds warnings about strptime
(cherry picked from commit 82b44dc4b97a9bd9a3e0720e06c4dda69995b998)

modules_k/presence_xml/pidf.c

@@ -31,7 +31,6 @@
  * \ingroup presence_xml
  */
 
-#include "../../sr_module.h"
 
 /**
  * make strptime available