CPU atomic path triggers warnings

[nsubtil]

Seen in Travis builds:

/home/travis/build/nsubtil/lift/lift/atomics_host.inl: In static member function static float lift::atomics<system>::add(float*, float) [with lift::target_system system = (lift::target_system)0u]: /home/travis/build/nsubtil/lift/lift/atomics_host.inl:56:111: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] __atomic_compare_exchange((volatile uint32 *)address, ^ /home/travis/build/nsubtil/lift/lift/atomics_host.inl:61:29: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] if (*((uint32 *)&expected) == *((uint32 *)&oldval)) ^ /home/travis/build/nsubtil/lift/lift/atomics_host.inl:61:57: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] if (*((uint32 *)&expected) == *((uint32 *)&oldval)) ^

https://travis-ci.org/nsubtil/lift/jobs/110036115