Use Azure Pipelines so we can target macOS 10.14 (#1042)

.github/workflows/build-macos.yml

@@ -1,37 +0,0 @@
-name: CMake Build (macOS x86-64)
-
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-    branches:
-      - master
-
-env:
-  BUILD_TYPE: Release
-
-jobs:
-  build:
-
-    runs-on: macos-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: Install dependencies
-      working-directory: ${{runner.workspace}}
-      run: brew install sdl2 qt@5 libslirp libarchive libepoxy
-    - name: Create build environment
-      run: mkdir ${{runner.workspace}}/build
-    - name: Configure
-      working-directory: ${{runner.workspace}}/build
-      run: |
-          cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DCMAKE_PREFIX_PATH="$(brew --prefix qt@5);$(brew --prefix libarchive)" -DMACOS_BUNDLE_LIBS=ON -DMACOS_BUILD_DMG=ON
-    - name: Make
-      working-directory: ${{runner.workspace}}/build
-      run: |
-        make -j$(sysctl -n hw.ncpu)
-    - uses: actions/upload-artifact@v1
-      with:
-        name: melonDS.dmg
-        path: ${{runner.workspace}}/build/melonDS.dmg