Suggest -dynamic-too in failNonStd when applicable

I encountered an error that says

```
Cannot load -dynamic objects when GHC is built the normal way
To fix this, either:
  (1) Use -fexternal-interpreter, or
  (2) Build the program twice: once the normal way, and then
      with -dynamic using -osuf to set a different object file suffix.
```

Or it could say

```
(2) Use -dynamic-too
```