axoupdater cross-compiles when building from source are failing

[mistydemeo]

We build axoupdater from source when requested to install it but we don't have prebuilt binaries for that target. Since we merged the cross-compile PR, which required us to make use of that infrastructure, crosses for axoupdater are failing even if the primary target works. For example, here's a failed build for x86_64-pc-windows-gnu, from a host that came with an x86_64-pc-windows-msvc toolchain natively: https://github.com/mistydemeo/cargodisttest/actions/runs/12125980084/job/33807259460

building x86_64-pc-windows-gnu target, from x86_64-pc-windows-msvc host, using cargo profile dist --workspace)
info: syncing channel updates for '1.77-x86_64-pc-windows-msvc'
info: latest update on 2024-04-09, rust version 1.77.2 (25ef9e3d8 2024-04-09)
info: downloading component 'cargo'
info: downloading component 'clippy'
info: downloading component 'rust-docs'
info: downloading component 'rust-std'
info: downloading component 'rustc'
info: downloading component 'rustfmt'
info: installing component 'cargo'
info: installing component 'clippy'
info: installing component 'rust-docs'
info: installing component 'rust-std'
info: installing component 'rustc'
info: installing component 'rustfmt'
    Updating crates.io index
 Downloading crates ...
  Downloaded tracing-attributes v0.1.27
  Downloaded zstd-sys v2.0.10+zstd.1.5.6
  Downloaded windows_x86_64_gnu v0.52.6
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   Compiling proc-macro2 v1.0.89
   Compiling unicode-ident v1.0.12
   Compiling windows_x86_64_gnu v0.52.6
   Compiling cfg-if v1.0.0
error[E0463]: can't find crate for `core`
  |
  = note: the `x86_64-pc-windows-gnu` target may not be installed
  = help: consider downloading the target with `rustup target add x86_64-pc-windows-gnu`