[Issue 22520] darwin: crt_destructor functions not executed on OSX 12

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22520

--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject.org> ---
So what we need to now do is generate a new crt_constructor function that
registers static destructors with __cxa_atexit().

--