Remove cross-compilation

.github/workflows/cross.yaml

@@ -1,47 +0,0 @@
-name: Cross compile
-
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-
-jobs:
-  cross:
-    name: Cross compile
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest]
-
-    steps:
-    - uses: actions/checkout@master
-
-    - name: Install nightly
-      uses: actions-rs/toolchain@v1
-      with:
-        toolchain: nightly
-        override: true
-
-    - name: Install docker
-      if: startsWith(matrix.os, 'ubuntu')
-      run: sudo apt install docker
-
-    - name: Install cross
-      run: cargo install cross
-
-    - name: Android
-      if: startsWith(matrix.os, 'ubuntu')
-      run: cross test --target arm-linux-androideabi
-
-    - name: NetBSD
-      if: startsWith(matrix.os, 'ubuntu')
-      run: cross build --target x86_64-unknown-netbsd
-
-    - name: FreeBSD
-      if: startsWith(matrix.os, 'ubuntu')
-      run: cross build --target x86_64-unknown-freebsd
-
-    - name: iOS
-      if: startsWith(matrix.os, 'macos')
-      run: cross build --target aarch64-apple-ios