message: enable test of wait_for_change()
diff: @@ -2008,7 +2008,7 @@ TEST_IF(Shared_AsyncMultiprocess, allow_async)
  #if !defined(_WIN32)
  // this test does not work with valgrind:
  -#if 0
  +#if 1
  // This test will hang infinitely instead of failing!!!
  TEST(Shared_WaitForChange)
  