Overriding `pragma(printf) @trusted` method is not safe

```d
class C
{
    extern (C) pragma(printf) int printf(const(char)*, ...) @trusted;
}

class D : C
{
    override extern (C) int printf(const(char)*, ...) @trusted;
}

void f(char* s) @safe
{
    C c = new C;
    c.printf("%s", s); // error
    D d = new D;
    d.printf("%s", s); // no error
}
```