Tests fail on OpenBSD with Rust 1.78.0

On OpenBSD current/amd64 (future version 7.6), tests fail with Rust 1.78.0.

• OS: OpenBSD amd64 (kernel = OpenBSD 7.5-current (GENERIC.MP) #114)
• Rust version 1.78.0 installed via OpenBSD ports

$ rustc -vV
rustc 1.78.0 (15adfb9cd 2024-04-28) (built from a source tarball)
binary: rustc
commit-hash: 15adfb9cd5b029268e1470a41391d91859b0a1f8
commit-date: 2024-04-28
host: x86_64-unknown-openbsd
release: 1.78.0
LLVM version: 16.0.6

• Clone lsd sources via Git
• Build OK

$ cargo build -v
(...)
$ target/debug/lsd --version
lsd 1.1.2

• Tests fail with cargo test:

$ cargo test -v
(...)
test theme::icon::tests::test_tmp_partial_default_theme_file ... ok

failures:

---- meta::inode::tests::test_inode_no_zero stdout ----
thread 'meta::inode::tests::test_inode_no_zero' panicked at src/meta/inode.rs:53:9:
failed to exec touch

---- meta::links::tests::test_hardlinks_no_zero stdout ----
thread 'meta::links::tests::test_hardlinks_no_zero' panicked at src/meta/links.rs:53:9:
failed to exec touch

---- meta::permissions::test::permission_octal_sticky stdout ----
thread 'meta::permissions::test::permission_octal_sticky' panicked at src/meta/permissions.rs:287:14:
unable to set permissions to file: Os { code: 79, kind: Uncategorized, message: "Inappropriate file type or format" }

---- meta::permissions::test::permission_rwx_sticky stdout ----
thread 'meta::permissions::test::permission_rwx_sticky' panicked at src/meta/permissions.rs:223:14:
unable to set permissions to file: Os { code: 79, kind: Uncategorized, message: "Inappropriate file type or format" }


failures:
    meta::inode::tests::test_inode_no_zero
    meta::links::tests::test_hardlinks_no_zero
    meta::permissions::test::permission_octal_sticky
    meta::permissions::test::permission_rwx_sticky

test result: FAILED. 385 passed; 4 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.98s

Reproduce the failures with cargo test on OpenBSD, then inspect src/meta/inode.rs, src/meta/links.rs, and src/meta/permissions.rs at the reported test locations. Determine the platform-specific cause and make the affected tests pass without regressing the other 385 passing tests.