Additional ARM platform support #4
Description
Hi, I had to use atomic-shim on my armv5te NAS (old stuff, but still working fine!). In order to make it work, I had to tweak this library to also shim on the arm platform. However this could become a cat-and-mouse game, as there is no way to have a complete and future-proof list of platforms that require shimming, and ARM platforms are generally a mess. However, in Rust 1.60+, the new cfg_target_has_atomic can be used to achieve a more precise indication about the availability of atomic operations.
It would be great if this library was updated to keep this setting into account.