Build fails on armv7: error[E0308]: mismatched types

```
Compiling target v2.0.0
Running `CARGO=/usr/local/bin/cargo CARGO_CRATE_NAME=target CARGO_MANIFEST_DIR=/wrkdirs/usr/ports/deskutils/just/work/just-1.6.0/cargo-crates/target-2.0.0 CARGO_PKG_AUTHORS='Casey Rodarmor ' CARGO_PKG_DESCRIPTION='Get information on compilation target' CARGO_PKG_HOMEPAGE='https://github.com/casey/target' CARGO_PKG_LICENSE=CC0-1.0 CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=target CARGO_PKG_REPOSITORY='' CARGO_PKG_RUST_VERSION='' CARGO_PKG_VERSION=2.0.0 CARGO_PKG_VERSION_MAJOR=2 CARGO_PKG_VERSION_MINOR=0 CARGO_PKG_VERSION_PATCH=0 CARGO_PKG_VERSION_PRE='' LD_LIBRARY_PATH='/wrkdirs/usr/ports/deskutils/just/work/target/release/deps:/usr/local/lib' /usr/local/bin/rustc --crate-name target /wrkdirs/usr/ports/deskutils/just/work/just-1.6.0/cargo-crates/target-2.0.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C linker-plugin-lto -C metadata=545826272a4c6b18 -C ext
ra-filename=-545826272a4c6b18 --out-dir /wrkdirs/usr/ports/deskutils/just/work/target/armv7-unknown-freebsd/release/deps --target armv7-unknown-freebsd -C linker=cc -L dependency=/wrkdirs/usr/ports/deskutils/just/work/target/armv7-unknown-freebsd/release/deps -L dependency=/wrkdirs/usr/ports/deskutils/just/work/target/release/deps --cap-lints warn -C link-arg=-fstack-protector-strong`
error[E0308]: mismatched types
--> /wrkdirs/usr/ports/deskutils/just/work/just-1.6.0/cargo-crates/target-2.0.0/src/lib.rs:61:17
|
61 | pub fn env() -> &'static str {
| --- ^^^^^^^^^^^^ expected `&str`, found `()`
| |
| implicitly returns `()` as its body has no tail or `return` expression

For more information about this error, try `rustc --explain E0308`.
error: could not compile `target` due to previous error

Caused by:
process didn't exit successfully: `CARGO=/usr/local/bin/cargo CARGO_CRATE_NAME=target CARGO_MANIFEST_DIR=/wrkdirs/usr/ports/deskutils/just/work/just-1.6.0/cargo-crates/target-2.0.0 CARGO_PKG_AUTHORS='Casey Rodarmor ' CARGO_PKG_DESCRIPTION='Get information on compilation target' CARGO_PKG_HOMEPAGE='https://github.com/casey/target' CARGO_PKG_LICENSE=CC0-1.0 CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=target CARGO_PKG_REPOSITORY='' CARGO_PKG_RUST_VERSION='' CARGO_PKG_VERSION=2.0.0 CARGO_PKG_VERSION_MAJOR=2 CARGO_PKG_VERSION_MINOR=0 CARGO_PKG_VERSION_PATCH=0 CARGO_PKG_VERSION_PRE='' LD_LIBRARY_PATH='/wrkdirs/usr/ports/deskutils/just/work/target/release/deps:/usr/local/lib' /usr/local/bin/rustc --crate-name target /wrkdirs/usr/ports/deskutils/just/work/just-1.6.0/cargo-crates/target-2.0.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C linker-plugin-lto -C metadata=
545826272a4c6b18 -C extra-filename=-545826272a4c6b18 --out-dir /wrkdirs/usr/ports/deskutils/just/work/target/armv7-unknown-freebsd/release/deps --target armv7-unknown-freebsd -C linker=cc -L dependency=/wrkdirs/usr/ports/deskutils/just/work/target/armv7-unknown-freebsd/release/deps -L dependency=/wrkdirs/usr/ports/deskutils/just/work/target/release/deps --cap-lints warn -C link-arg=-fstack-protector-strong` (exit status: 1)
warning: build failed, waiting for other jobs to finish...
```

Happens during build of just-1.6.0
FreeBSD 13.1