OSX support in dmd appears to be having problems

[Richard Andrew Cattermole (Rikki)]

I'm looking over the OSX build logs atm, and I'm noticing a lot 
of warnings being generated.

These warnings appear to come in the forms:

1. ``warning: could not find referenced DIE`` (debug info)

2. ``warning: (x86_64)  could not find object file symbol for 
symbol SYMBOL``

3. ``ld: warning: could not create compact unwind for SYMBOL: 
offset of saved registers too far to encode``

See: 
https://github.com/dlang/dmd/actions/runs/18517485989/job/52770757595?pr=21970
https://github.com/dlang/dmd/actions/runs/18517485989/job/52770757597?pr=21970

The result is the OSX build for dmd appears not to finish CI and 
times out at 40m (we should be able to bump that up).

Unfortunately, I am of no help to debug let alone fix these 
issues.