[bug#30831] building rust on aarch64

[Efraim Flashner]

I tested the patch on my aarch64 box and with the following patch I was
able to start the building process. Currently rust fails its test stage
with the error:

test result: ok. 193 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out

        finished in 267.991
Testing libstd stage1 (aarch64-unknown-linux-gnu -> aarch64-unknown-linux-gnu)
   Compiling libc v0.2.34
   Compiling core v0.0.0 
(file:///tmp/guix-build-rust-1.24.1.drv-0/rustc-1.24.1-src/src/libcore)
   Compiling std_unicode v0.0.0 
(file:///tmp/guix-build-rust-1.24.1.drv-0/rustc-1.24.1-src/src/libstd_unicode)
   Compiling rand v0.3.19
   Compiling std v0.0.0 
(file:///tmp/guix-build-rust-1.24.1.drv-0/rustc-1.24.1-src/src/libstd)
   Compiling alloc v0.0.0 
(file:///tmp/guix-build-rust-1.24.1.drv-0/rustc-1.24.1-src/src/liballoc)
error: unused attribute
   --> src/libstd/sys/unix/process/process_common.rs:449:5
    |
449 |     #[ignore]
    |     ^^^^^^^^^
    |
note: lint level defined here
   --> src/libstd/lib.rs:232:9
    |
232 | #![deny(warnings)]
    |         ^^^^^^^^
    = note: #[deny(unused_attributes)] implied by #[deny(warnings)]

error: aborting due to previous error

error: Could not compile `std`.
warning: build failed, waiting for other jobs to finish...
error: build failed


command did not execute successfully: 
"/gnu/store/3vvhw5xpbcym5l3xk2pszzzyx4m7k8l6-cargo-bootstrap-0.24.0/bin/cargo" 
"test" "--target" "aarch64-unknown-linux-gnu" "-j" "6" "--release" "--frozen" 
"--features" "panic-unwind jemalloc backtrace" "--manifest-p
ath" "/tmp/guix-build-rust-1.24.1.drv-0/rustc-1.24.1-src/src/libstd/Cargo.toml" 
"-p" "std:0.0.0" "-p" "libc:0.0.0" "-p" "alloc_system:0.0.0" "-p" 
"panic_abort:0.0.0" "-p" "compiler_builtins:0.0.0" "-p" "alloc:0.0.0" "-p" 
"std_unicode:0.0.0" "-p" "unwind:0
.0.0" "-p" "core:0.0.0" "--"
expected success, got: exit code: 101


failed to run: 
/tmp/guix-build-rust-1.24.1.drv-0/rustc-1.24.1-src/build/bootstrap/debug/bootstrap
 test
Build completed unsuccessfully in 1:53:33
phase `check' failed after 6813.3 seconds


This is ultimately no different from master, where rust currently fails
somewhere during the test stage.

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