rustc armv7 gnueabihf tarballs since 07-23 package files for x86-64

[hdhoang]

Reproduction:

$ wget -O rustc-nightly-armv7-unknown-linux-gnueabihf.tar.xz https://static.rust-lang.org/dist/2017-07-23/rustc-nightly-armv7-unknown-linux-gnueabihf.tar.xz
$ tar xf rustc-nightly-armv7-unknown-linux-gnueabihf.tar.xz rustc-nightly-armv7-unknown-linux-gnueabihf/rustc/bin/
$ file rustc-nightly-armv7-unknown-linux-gnueabihf/rustc/bin/rust*c
rustc-nightly-armv7-unknown-linux-gnueabihf/rustc/bin/rustc:     ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=6cd5b2aab6699d6026ad53d7e8456dbb86fe40a3, not stripped
rustc-nightly-armv7-unknown-linux-gnueabihf/rustc/bin/rustdoc:   ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=35347f46181fd4543575852d2cee9eaef6d531d1, not stripped

Expected result, from 2017-07-22 tarball:

rustc-nightly-armv7-unknown-linux-gnueabihf/rustc/bin/rustc:     ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-armhf.so.3, for GNU/Linux 3.2.72, not stripped
rustc-nightly-armv7-unknown-linux-gnueabihf/rustc/bin/rustdoc:   ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-armhf.so.3, for GNU/Linux 3.2.72, not stripped

AFAICT, cargo and rls tarballs are okay.

[xen0n]

All non-x86 rustc tarballs are borked. I've seen x86_64 binaries for MIPS64el too.

Almost certainly #43059, but I'm not particularly familiar with that code.

[xen0n]

cc @Mark-Simulacrum @alexcrichton

[xen0n]

Same as #43427.

[alexcrichton]

Indeed! Closing in favor of #43427