enum/class named `Attribute` will fail at runtime with PHP 8

```haxe
enum Attribute { // rename Attribute to anything to workaround
A;
}

class Test {
static function main() {
trace(A);
}
}
```

Runtime error with PHP 8.0.3
```
Fatal error: Uncaught Error: Call to undefined method Attribute::A() in /Users/andy/Documents/workspace/ansi/bin/php/lib/Test.php:16
Stack trace:
#0 /Users/andy/Documents/workspace/ansi/bin/php/index.php(13): Test::main()
#1 {main}
thrown in /Users/andy/Documents/workspace/ansi/bin/php/lib/Test.php on line 16

PHP Fatal error: Uncaught Error: Call to undefined method Attribute::A() in /Users/andy/Documents/workspace/ansi/bin/php/lib/Test.php:16
Stack trace:
#0 /Users/andy/Documents/workspace/ansi/bin/php/index.php(13): Test::main()
#1 {main}
thrown in /Users/andy/Documents/workspace/ansi/bin/php/lib/Test.php on line 16
Error: Command failed with error 255
```

Note that it runs fine with PHP 7.4.