test suite failing on armhf, armel, i386 arch

The testsuite of your package is failing on some architectures armhf, armel, i386 while it runs fine on amd64 arm64 ppc64el, 390x

https://ci.debian.net/packages/r/rust-datasize/testing/i386/40116329/
```
test std::tests::test_nested_detailed_struct ... FAILED
119s
119s failures:
119s
119s ---- std::tests::test_nested_detailed_struct stdout ----
119s thread 'std::tests::test_nested_detailed_struct' panicked at 'assertion failed: `(left == right)`
119s left: `Detailed({"c": Size(0), "a": Size(16), "b": Detailed({"dummy": Size(0), "value": Size(8)})})`,
119s right: `Detailed({"c": Size(0), "a": Size(24), "b": Detailed({"value": Size(8), "dummy": Size(0)})})`', src/std.rs:492:9
119s stack backtrace:
119s 0: rust_begin_unwind
119s at /usr/src/rustc-1.70.0/library/std/src/panicking.rs:578:5
119s 1: core::panicking::panic_fmt
119s at /usr/src/rustc-1.70.0/library/core/src/panicking.rs:67:14
119s 2: core::panicking::assert_failed_inner
119s 3: core::panicking::assert_failed
119s at /usr/src/rustc-1.70.0/library/core/src/panicking.rs:228:5
119s 4: datasize::std::tests::test_nested_detailed_struct
119s at ./src/std.rs:492:9
119s 5: datasize::std::tests::test_nested_detailed_struct::{{closure}}
119s at ./src/std.rs:450:38
119s 6: core::ops::function::FnOnce::call_once
119s at /usr/src/rustc-1.70.0/library/core/src/ops/function.rs:250:5
119s 7: core::ops::function::FnOnce::call_once
119s at /usr/src/rustc-1.70.0/library/core/src/ops/function.rs:250:5
119s note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
119s
119s
119s failures:
119s std::tests::test_nested_detailed_struct
```

https://ci.debian.net/packages/r/rust-datasize/testing/armhf/40116155/
```
31s test std::tests::test_nested_detailed_struct ... FAILED
131s
131s failures:
131s
131s ---- std::tests::test_nested_detailed_struct stdout ----
131s thread 'std::tests::test_nested_detailed_struct' panicked at 'assertion failed: `(left == right)`
131s left: `Detailed({"a": Size(16), "b": Detailed({"value": Size(8), "dummy": Size(0)}), "c": Size(0)})`,
131s right: `Detailed({"a": Size(24), "b": Detailed({"dummy": Size(0), "value": Size(8)}), "c": Size(0)})`', src/std.rs:492:9
131s stack backtrace:
131s 0: rust_begin_unwind
131s at /usr/src/rustc-1.70.0/library/std/src/panicking.rs:578:5
131s 1: core::panicking::panic_fmt
131s at /usr/src/rustc-1.70.0/library/core/src/panicking.rs:67:14
131s 2: core::panicking::assert_failed_inner
131s 3: core::panicking::assert_failed
131s at /usr/src/rustc-1.70.0/library/core/src/panicking.rs:228:5
131s 4: datasize::std::tests::test_nested_detailed_struct
131s at ./src/std.rs:492:9
131s 5: datasize::std::tests::test_nested_detailed_struct::{{closure}}
131s at ./src/std.rs:450:38
131s 6: core::ops::function::FnOnce::call_once
131s at /usr/src/rustc-1.70.0/library/core/src/ops/function.rs:250:5
131s 7: core::ops::function::FnOnce::call_once
131s at /usr/src/rustc-1.70.0/library/core/src/ops/function.rs:250:5
131s note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
131s
131s
131s failures:
131s std::tests::test_nested_detailed_struct
```

https://ci.debian.net/packages/r/rust-libheif-rs/testing/arm64/39958911/
```
122s test std::tests::test_nested_detailed_struct ... FAILED
122s
122s failures:
122s
122s ---- std::tests::test_nested_detailed_struct stdout ----
122s thread 'std::tests::test_nested_detailed_struct' panicked at 'assertion failed: `(left == right)`
122s left: `Detailed({"c": Size(0), "b": Detailed({"dummy": Size(0), "value": Size(8)}), "a": Size(16)})`,
122s right: `Detailed({"a": Size(24), "b": Detailed({"value": Size(8), "dummy": Size(0)}), "c": Size(0)})`', src/std.rs:492:9
122s stack backtrace:
122s 0: rust_begin_unwind
122s at /usr/src/rustc-1.70.0/library/std/src/panicking.rs:578:5
122s 1: core::panicking::panic_fmt
122s at /usr/src/rustc-1.70.0/library/core/src/panicking.rs:67:14
122s 2: core::panicking::assert_failed_inner
122s 3: core::panicking::assert_failed
122s at /usr/src/rustc-1.70.0/library/core/src/panicking.rs:228:5
122s 4: datasize::std::tests::test_nested_detailed_struct
122s at ./src/std.rs:492:9
122s 5: datasize::std::tests::test_nested_detailed_struct::{{closure}}
122s at ./src/std.rs:450:38
122s 6: core::ops::function::FnOnce::call_once
122s at /usr/src/rustc-1.70.0/library/core/src/ops/function.rs:250:5
122s 7: core::ops::function::FnOnce::call_once
122s at /usr/src/rustc-1.70.0/library/core/src/ops/function.rs:250:5
122s note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
122s
122s
122s failures:
122s std::tests::test_nested_detailed_struct
122s
122s test result: FAILED. 23 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
122s
```