[Issue 23729] ignore custom object.d for CTFE needs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23729

--- Comment #7 from ryuukk_ <ryuukk.dev at gmail.com> ---
The problem is CTFE because the atomics module call this function:

https://github.com/dlang/dmd/blob/d344030e01688fbe99b82438f4dae8dfa3f6aee3/druntime/src/core/internal/atomic.d#L1097


Wich does ``string append`` wich is not available in -betterC

So it is a bug in the compiler, because he don't understand that DMD should use
its object.d, not mine, i use -betterC, i don't have string append

--