Fix for newer nightly

1 job for no_std in 59 seconds (queued for 3 seconds)
latest
Name Stage Failure
failed
test:cargo Test

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error: could not compile `orbclient`.

Caused by:
process didn't exit successfully: `rustc --crate-name orbclient src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata -C debuginfo=2 --cfg 'feature="default"' -C metadata=fde9515e878831b8 -C extra-filename=-fde9515e878831b8 --out-dir /builds/redox-os/orbclient/target/x86_64-unknown-redox/debug/deps --target x86_64-unknown-redox -C incremental=/builds/redox-os/orbclient/target/x86_64-unknown-redox/debug/incremental -L dependency=/builds/redox-os/orbclient/target/x86_64-unknown-redox/debug/deps -L dependency=/builds/redox-os/orbclient/target/debug/deps` (exit code: 1)
ERROR: Job failed: exit code 1