Don't attempt to export old _MPI.py scripts

examples/Makefile.am

-# This file is part of SWIFT.
+# tHIS FIle is part of SWIFT.
 # Copyright (c) 2012 Pedro Gonnet (pedro.gonnet@durham.ac.uk),
 #                    Matthieu Schaller (matthieu.schaller@durham.ac.uk).
 #
@@ -95,9 +95,7 @@ EXTRA_DIST = BigCosmoVolume/makeIC.py \
 EXTRA_DIST += parameter_example.yml
 
 # Scripts to plot task graphs
-EXTRA_DIST += plot_tasks_MPI.py plot_tasks.py \
-              analyse_tasks_MPI.py analyse_tasks.py \
-	      process_plot_tasks_MPI process_plot_tasks
+EXTRA_DIST += plot_tasks.py analyse_tasks.py process_plot_tasks_MPI process_plot_tasks
 
 # Scripts to plot threadpool 'task' graphs
 EXTRA_DIST += analyse_threadpool_tasks.py \