Skip test run with valgrind as test has restarts

mysql-test/suite/innodb/t/innodb_prefix_index_restart_server.test

@@ -9,6 +9,8 @@
 #                                                                    #
 ######################################################################
 
+# Don't test this under valgrind, memory leaks will occur due restart
+--source include/not_valgrind.inc
 # Test restart the server and "shutdown_server" looks for pid file
 # which is not there with embedded mode
 --source include/not_embedded.inc