message: remove Windows / macOS tests
  We already test the Windows / macOS build stage for x86 and
  should redo it for ARM.
diff: @@ -21,7 +21,7 @@ jobs:
  runs-on: ${{ matrix.os }}
  strategy:
  matrix:
  - os: [ubuntu-latest, macos-latest, windows-latest]
  + os: [ubuntu-latest]
  steps:
  - name: Checkout rusty-hermit
  uses: actions/checkout@v2
  @@ -47,21 +47,10 @@ jobs:
  working-directory: loader
  env:
  HERMIT_APP: ../../../../target/aarch64-unknown-hermit/debug/hello_world
  - - name: Install QEMU (ubuntu)
  - if: ${{ matrix.os == 'ubuntu-latest' }}
  + - name: Install QEMU
  run: |
  sudo apt-get update
  sudo apt-get install qemu-system-aarch64
  - - name: Install QEMU (macos)
  - if: ${{ matrix.os == 'macos-latest' }}
  - run: |
  - brew update
  - brew install qemu
  - - name: Install QEMU, GNU make (windows)
  - if: ${{ matrix.os == 'windows-latest' }}
  - run: |
  - choco install qemu make
  - echo "C:\Program Files\qemu" >> $GITHUB_PATH
  - name: Test kernel
  run: qemu-system-aarch64 -semihosting -display none -smp 4 -m 1G -serial stdio -kernel target/aarch64-unknown-hermit-loader/debug/rusty-loader -machine raspi3
  working-directory: loader
  