(Re)add ARM support on Windows and Linux

[agarny]

We used to have that support but we removed it because of some issues with LLVM+Clang 18.1.6 (see c92e6da). But, now that we are using LLVM+Clang 18.1.8, maybe it could work again?

It looks like we might have to build LLVM+Clang on Windows/Linux ARM using Clang. For this, we might want to check:

• https://llvm.org/docs/HowToCrossCompileLLVM.html
• https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html

[agarny]

Fixed as a result of merging PR #372.