cross 0.1.15-dev

Zero setup cross compilation and cross testing
# source: https://github.com/rust-lang/cargo/blob/master/ci/azure-install-rust.yml

steps:
  - bash: |
      set -e
      if command -v rustup; then
        echo `command -v rustup` `rustup -V` already installed
        rustup self update
      elif [ "$AGENT_OS" = "Windows_NT" ]; then
        curl -sSf -o rustup-init.exe https://win.rustup.rs
        rustup-init.exe -y --default-toolchain $TOOLCHAIN
        echo "##vso[task.prependpath]$USERPROFILE/.cargo/bin"
      else
        curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain $TOOLCHAIN
        echo "##vso[task.prependpath]$HOME/.cargo/bin"
      fi
    displayName: Install rustup

  - bash: |
      set -e
      rustup update $TOOLCHAIN
      rustup default $TOOLCHAIN
    displayName: Install rust

  - bash: |
      set -ex
      rustup -V
      rustc -Vv
      cargo -V
    displayName: Query rust and cargo versions