[BE] Properly mark destructor overrides (#119656)
Otherwise, at least on MacOS builds are littered with:
```
In file included from /Users/malfet/git/pytorch/pytorch/aten/src/ATen/DeviceAccelerator.h:6:
/Users/malfet/git/pytorch/pytorch/aten/src/ATen/detail/MTIAHooksInterface.h:23:11: warning: '~MTIAHooksInterface' overrides a destructor but is not marked 'override' [-Winconsistent-missing-destructor-override]
virtual ~MTIAHooksInterface() = default;
^
/Users/malfet/git/pytorch/pytorch/aten/src/ATen/detail/CUDAHooksInterface.h:65:11: warning: '~CUDAHooksInterface' overrides a destructor but is not marked 'override' [-Winconsistent-missing-destructor-override]
virtual ~CUDAHooksInterface() = default;
^
/Users/malfet/git/pytorch/pytorch/aten/src/ATen/detail/AcceleratorHooksInterface.h:15:11: note: overridden virtual function is here
virtual ~AcceleratorHooksInterface() = default;
^
/Users/malfet/git/pytorch/pytorch/aten/src/ATen/detail/MPSHooksInterface.h:21:11: warning: '~MPSHooksInterface' overrides a destructor but is not marked 'override' [-Winconsistent-missing-destructor-override]
virtual ~MPSHooksInterface() = default;
^
/Users/malfet/git/pytorch/pytorch/aten/src/ATen/detail/AcceleratorHooksInterface.h:15:11: note: overridden virtual function is here
virtual ~AcceleratorHooksInterface() = default;
^
```
Likely introduced by https://github.com/pytorch/pytorch/pull/119329
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119656
Approved by: https://github.com/Skylion007
