Jakub Konka d1e4600675 test: correctly track identical error msgs in handled errors list
Prior to this change, for an example compiler error test case with
multiple identical errors messages such as

```
:1:2: error: foo
:1:2: error: foo
```

the test harness would never increment the error index thus only
marking the very first error message as handled yielding a false
positive.

Additionally, while here, regress `dereference_anyopaque` test case
as not passing on `wasm32-wasi` target.
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..
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