[Bug 281600] lang/rust failing to build on risc-v (again)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281600

--- Comment #75 from Jessica Clarke <jrtc27@freebsd.org> ---
I can confirm that, if rust is updated to use the latest (v0.2.176) release of
the libc crate that bumps the FreeBSD ABI, rustc works. Comparing a pristine
rust ("rust-freebsd11") with one where libc has been bumped ("rust-freebsd12")
(both cross-compiled with upstream's build scripts for simplicity of testing):

```
root@freebsd-riscv64:~/project # PATH=/opt/rust-freebsd11/bin:$PATH cargo clean
     Removed 21 files, 1.2MiB total
root@freebsd-riscv64:~/project # PATH=/opt/rust-freebsd11/bin:$PATH cargo build
   Compiling project v0.1.0 (/root/project)
error: could not compile `project` (bin "project")

Caused by:
  process didn't exit successfully: `rustc --crate-name project --edition=2024
src/main.rs --error-format=json
--json=diagnostic-rendered-ansi,artifacts,future-incompat
--diagnostic-width=241 --crate-type bin --emit=dep-info,link -C
embed-bitcode=no -C debuginfo=2 --check-cfg 'cfg(docsrs,test)' --check-cfg
'cfg(feature, values())' -C metadata=8d96d6deb0693d67 -C
extra-filename=-cc38c8eadff4f4b3 --out-dir /root/project/target/debug/deps -C
incremental=/root/project/target/debug/incremental -L
dependency=/root/project/target/debug/deps` (signal: 12, SIGSYS: bad system
call)
root@freebsd-riscv64:~/project # PATH=/opt/rust-freebsd12/bin:$PATH cargo clean
     Removed 4 files, 599B total
root@freebsd-riscv64:~/project # PATH=/opt/rust-freebsd12/bin:$PATH cargo build
   Compiling project v0.1.0 (/root/project)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.00s
root@freebsd-riscv64:~/project # PATH=/opt/rust-freebsd12/bin:$PATH cargo run
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.86s
     Running `target/debug/project`
Hello, world!
```

This is testing using the default hello world project created by cargo init.

So now we "just" need ports to be updated to versions that use libc >= 0.2.176.

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