bug#47019: Rust 1.26.2 from the master branch fails to build on aarch64-linux

[Christopher Baines]

The failure seems to occur in the check phase, see the build logs
referenced from:

https://data.guix-patches.cbaines.net/gnu/store/c3f7d3ziwjfkwg3j7xz47dj44sb2l5av-rust-1.26.2.drv

This looks like a relevant error:

---- [compile-fail] compile-fail/issue-15919.rs stdout ----
        

executing 
"/tmp/guix-build-rust-1.26.2.drv-0/rustc-1.26.2-src/build/aarch64-unknown-linux-gnu/stage2/bin/rustc"
 
"/tmp/guix-build-rust-1.26.2.drv-0/rustc-1.26.2-src/src/test/compile-fail/issue-15919.rs"
 "-L" 
"/tmp/guix-build-rust-1.26.2.drv-0/rustc-1.26.2-src/build/aarch64-unknown-linux-gnu/test/compile-fail"
 "--target=aarch64-unknown-linux-gnu" "-Zui-testing" "-C" "prefer-dynamic" "-o" 
"/tmp/guix-build-rust-1.26.2.drv-0/rustc-1.26.2-src/build/aarch64-unknown-linux-gnu/test/compile-fail/issue-15919.stage2-aarch64-unknown-linux-gnu"
 "-Crpath" "-O" "-Zmiri" "-Zunstable-options" 
"-Lnative=/tmp/guix-build-rust-1.26.2.drv-0/rustc-1.26.2-src/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
 "-L" 
"/tmp/guix-build-rust-1.26.2.drv-0/rustc-1.26.2-src/build/aarch64-unknown-linux-gnu/test/compile-fail/issue-15919.stage2-aarch64-unknown-linux-gnu.aux"
 "-A" "unused"
------stdout------------------------------

------stderr------------------------------
error: the type `[usize; 18446744073709551615]` is too big for the current 
architecture

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