`STR37-C`:  `<ctype>` functions implemented as macros not properly detected

### Affected rules
 - `STR37-C`

### Description

The functions in the `<ctype>` header can be implemented either by macros or functions, however this query only detects cases where these functions are implemented by a function.

### Example

```cpp
isalpha(c); // This is a macro invocation on gcc and clang
```
