Rust amd64 build failure.

[Mike Pumford <mpumford%mudcovered.org.uk@localhost>]

Seen on fresh chroot build environment for 9.3-STABLE amd64.

In case its relevent the actual build host is a 10-BETA system using 
libkver to fake the 9.3 stable environment.


===> Building for rust-1.68.2
pre-installed rustc not detected: [Errno 2] No such file or directory: 
'rustc'
falling back to auto-detect
Building rustbuild
running: /comp/obj/pkgsrc/lang/rust/work/rust-bootstrap/bin/cargo build 
--manifest-path 
/comp/obj/pkgsrc/lang/rust/work/rustc-1.68.2-src/src/bootstrap/Cargo.toml 
--frozen
thread 'main' panicked at 'unexpected error from isatty: 45', 
/cargo/registry/src/github.com-1ecc6299db9ec823/rustix-0.36.3/src/backend/libc/termios/syscalls.rs:141:20
note: run with `RUST_BACKTRACE=1` environment variable to display a 
backtrace
Traceback (most recent call last):
  File "/comp/obj/pkgsrc/lang/rust/work/rustc-1.68.2-src/./x.py", line 
28, in <module>
    bootstrap.main()
  File 
"/comp/obj/pkgsrc/lang/rust/work/rustc-1.68.2-src/src/bootstrap/bootstrap.py", 
line 952, in main
    bootstrap(help_triggered)
  File 
"/comp/obj/pkgsrc/lang/rust/work/rustc-1.68.2-src/src/bootstrap/bootstrap.py", 
line 929, in bootstrap
    build.build_bootstrap(args.color)
  File 
"/comp/obj/pkgsrc/lang/rust/work/rustc-1.68.2-src/src/bootstrap/bootstrap.py", 
line 798, in build_bootstrap
    run(args, env=env, verbose=self.verbose, cwd=self.rust_root)
  File 
"/comp/obj/pkgsrc/lang/rust/work/rustc-1.68.2-src/src/bootstrap/bootstrap.py", 
line 166, in run
    raise RuntimeError(err)
RuntimeError: failed to run: 
/comp/obj/pkgsrc/lang/rust/work/rust-bootstrap/bin/cargo build 
--manifest-path 
/comp/obj/pkgsrc/lang/rust/work/rustc-1.68.2-src/src/bootstrap/Cargo.toml 
--frozen
*** Error code 1

Stop.
make[1]: stopped in /usr/pkgsrc/lang/rust
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/lang/rust
Build lang/rust completed with status 1

Mike