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Integrate the `Error` type with `errname()` by providing a new `name()` method. Then, implement `Debug` for the type using the new method. [ Miguel: under `CONFIG_SYMBOLIC_ERRNAME=n`, `errname()` is a `static inline`, so added a helper to support that case, like we had in the `rust` branch. Also moved `#include` up and reworded commit message for clarity. ] Co-developed-by: Wedson Almeida Filho <[email protected]> Signed-off-by: Wedson Almeida Filho <[email protected]> Co-developed-by: Sven Van Asbroeck <[email protected]> Signed-off-by: Sven Van Asbroeck <[email protected]> Signed-off-by: Gary Guo <[email protected]> Signed-off-by: Alice Ryhl <[email protected]> Reviewed-by: Martin Rodriguez Reboredo <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Miguel Ojeda <[email protected]>