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Per [1], arm is for 32-bit. For an upcoming change, we need to detect AArch64 specifically. Specifying arm in the cross file will result in the wrong build script behavior. [1]: https://mesonbuild.com/Reference-tables.html#cpu-families Reviewed-by: Helen Koike <helen.koike@collabora.com> Reviewed-by: Emma Anholt <emma@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22418>