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Consistent with other cases for these tests, we opt not to add the target to check-all if they're known to fail. The tests fail when cross compiling for a different architecture because the host Python3_EXECUTABLE is used to run them, and FFI calls will of course fail against the libraries compiled for the target. Do note that CMAKE_CROSSCOMPILING is set to true whenever CMAKE_SYSTEM_NAME was set manually <https://cmake.org/cmake/help/latest/variable/CMAKE_CROSSCOMPILING.html> so in some circumstances it may be set even when not cross-compiling. However, it's the best way of checking that CMake has right now, and we use it elsewhere in LLVM's build system.