Commits on Aug 22, 2022

1. build-support/rust: toTargetArch: strip off endianness …

   `toTargetArch` in `pkgs/build-support/rust/lib/default.nix` is used to
   set `CARGO_CFG_TARGET_ARCH`.  This environment variable is supposed to
   be the `<arch>` portion of an LLVM-style platform name:
   
   ```
   <arch><sub>-<kernel>-<libc><abi>
   ```
   
   Note that the pointer-width (the "64" in "x86_64" and "mips64") is
   part of `<arch>`, but the endianness (the `_be` in `aarch64_be`) is
   *not*.
   
   Unfortunately at the moment nixpkgs' parsed `cpuType` has no way to
   query for the three subparts (name, pointer-width, and
   subarch/endianness), nor any way to ask for just the first two parts.
   
   For now, this commit simply fixes the problem in the two cases that
   matter: `mips64el` and `powerpc64le`, which I believe are the only two
   platforms supported by both rust and nixpkgs which have a
   "subarchitecture".

   Adam Joseph committed Aug 22, 2022
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