Bug#30560 Valgrind option to mysql-test-run with spaces in cause strange error

mysql-test/mysql-test-run.pl:
  Just pass the $opt_valgrind_options to mtr_add_arg - it does a
  "push(@$args, sprintf($format, @fargs));" behind the scenes

mysql-test/mysql-test-run.pl

@@ -5007,7 +5007,7 @@ sub valgrind_arguments {
   }
 
   # Add valgrind options, can be overriden by user
-  mtr_add_arg($args, '%s', $_) for (split(' ', $opt_valgrind_options));
+  mtr_add_arg($args, '%s', $opt_valgrind_options);
 
   mtr_add_arg($args, $$exe);