#1528 Add an openmpi Valgrind suppression.

ExternalTools/Valgrind/openmpi.suppr

@@ -504,5 +504,16 @@
    fun:start_thread
 }
 
-
+{
+   <insert_a_suppression_name_here>
+   Memcheck:Leak
+   match-leak-kinds: indirect
+   fun:malloc
+   fun:strdup
+   ...
+   fun:event_process_active_single_queue
+   fun:event_process_active
+   fun:opal_libevent2022_event_base_loop
+   obj:*
+}