unix/mpconfigport_dev.h: Enable MICROPY_CAN_OVERRIDE_BUILTIN_NAMESPACES.
#define MICROPY_PY_BUILTINS_SLICE_INDICES (1)
#define MICROPY_PY_GENERATOR_NOT_RUN_WARN (1)
#define MICROPY_PY_MICROPYTHON_FUNCTION (1)
+#define MICROPY_CAN_OVERRIDE_BUILTIN_NAMESPACES (1)
#define MICROPY_PY_SYS_GETSIZEOF (1)
#define MICROPY_PY_SYS_INTERN (1)
#define MICROPY_PY_SYS_ROPROXY (1)
