Failures in Linux armv7 uclibceabihf CI target

[JonathanWoollett-Light]

The Linux armv7 uclibceabihf CI target is failing in multiple unrelated PRs e.g.:

• https://github.com/nix-rust/nix/pull/1948/checks?check_run_id=10378264392
• https://github.com/nix-rust/nix/pull/1945/checks?check_run_id=10378274766
• https://github.com/nix-rust/nix/pull/1947/checks?check_run_id=10378270076

With

$TOOL +$TOOLCHAIN clippy $ZFLAGS --target $TARGET --all-targets -- -D warnings
    Checking nix v0.26.1 (/tmp/cirrus-ci-build)
error: argument to `std::mem::size_of_val()` is a reference to a reference
    --> src/sys/socket/mod.rs:1295:17
     |
1295 |                 mem::size_of_val(&iv) + iv.len()
     |                 ^^^^^^^^^^^^^^^^^^^^^
     |
     = help: dereference the argument to `std::mem::size_of_val()` to get the size of the value instead of the size of the reference-type
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#size_of_ref
     = note: `-D clippy::size-of-ref` implied by `-D warnings`

error: argument to `std::mem::size_of_val()` is a reference to a reference
    --> src/sys/socket/mod.rs:1295:17
     |
1295 |                 mem::size_of_val(&iv) + iv.len()
     |                 ^^^^^^^^^^^^^^^^^^^^^
     |
     = help: dereference the argument to `std::mem::size_of_val()` to get the size of the value instead of the size of the reference-type
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#size_of_ref
note: the lint level is defined here
    --> src/lib.rs:46:24
     |
46   | #![cfg_attr(test, deny(warnings))]
     |                        ^^^^^^^^
     = note: `#[deny(clippy::size_of_ref)]` implied by `#[deny(warnings)]`

error: could not compile `nix` due to previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `nix` due to previous error

Exit status: 101