ext/bcmath - Compares `0` and `-0` as different values

### Description

The following code:

```php
<?php

var_dump(bccomp('0.001', '-0.001', 1));
```

Resulted in this output:
```
int(1)
```

But I expected this output instead:
```
int(0)
```

https://3v4l.org/fhXaL

I've identified the cause, but it's too late today so I'll fix it tomorrow...

### PHP Version

PHP 8.4 >=

### Operating System

_No response_