`DIR-5-1`:  false negatives in strtok

### Affected rules
 - `DIR-5-1`
 - `RULE-4-1-3`

### Description

Just a typo causing us to not mark the function `strtok` as non-reentrant

### Example
<add an example of code that illustrates the problem>
```cpp
void f() {
  strtok(...); // non-reentrant
}
```
