GH Actions: build JACK host API with MinGW and MSVC using vcpkg

I was not able to get Ubuntu MinGW to build with JACK. I got
different link errors with every combination of static/dynamic
JACK/PortAudio.

.github/workflows/cmake.yml

@@ -28,27 +28,35 @@ jobs:
             cmake_options:
               -DASIO=ON
               -DASIO_SDK_ZIP_PATH=asiosdk.zip
-              -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/i686-w64-mingw32.cmake
+              -DCMAKE_TOOLCHAIN_FILE=/home/runner/work/portaudio/portaudio/cmake/toolchains/i686-w64-mingw32.cmake
           - name: Windows MSVC
             os: windows-latest
             install_dir: C:\portaudio
+            vcpkg_extra_ports: tre pthreads
+            vcpkg_triplet: x64-windows
+            vcpkg_bootstrap: ./bootstrap-vcpkg.bat
             cmake_generator: "Visual Studio 16 2019"
             # ASIO_SDK_ZIP_PATH needs to be quoted or CMake will save the download to
             # asiosdk instead of asiosdk.zip.
             asio_sdk_cache_path: "asiosdk.zip"
             cmake_options:
               -DASIO=ON
               -DASIO_SDK_ZIP_PATH="asiosdk.zip"
+              -DCMAKE_TOOLCHAIN_FILE=D:\a\portaudio\portaudio\vcpkg\scripts\buildsystems\vcpkg.cmake
           - name: Windows MinGW
             os: windows-latest
             install_dir: C:\portaudio
+            vcpkg_extra_ports: tre
+            vcpkg_triplet: x64-mingw-static
+            vcpkg_bootstrap: ./bootstrap-vcpkg.bat
             cmake_generator: "MinGW Makefiles"
             # ASIO_SDK_ZIP_PATH needs to be quoted or CMake will save the download to
             # asiosdk instead of asiosdk.zip.
             asio_sdk_cache_path: "asiosdk.zip"
             cmake_options:
               -DASIO=ON
               -DASIO_SDK_ZIP_PATH="asiosdk.zip"
+              -DCMAKE_TOOLCHAIN_FILE=D:\a\portaudio\portaudio\vcpkg\scripts\buildsystems\vcpkg.cmake
           - name: macOS Clang
             os: macOS-latest
             install_dir: ~/portaudio
@@ -84,12 +92,23 @@ jobs:
       with:
         path: ${{ matrix.asio_sdk_cache_path }}
         key: ${{ hashFiles('.github/asiosdk-version.txt') }}
+    - name: "[Windows/MinGW] install dependencies from vcpkg"
+      if: runner.os == 'Windows'
+      run: |
+        # TODO: switch to upstream vcpkg when https://github.com/microsoft/vcpkg/pull/19270 is merged.
+        git clone --depth 1 https://github.com/Be-ing/vcpkg.git -b jack2_1.9.19
+        cd vcpkg
+        ${{ matrix.vcpkg_bootstrap }}
+        ./vcpkg install jack2 ${{ matrix.vcpkg_extra_ports }}
+      env:
+        VCPKG_DEFAULT_TRIPLET: ${{ matrix.vcpkg_triplet }}
     - name: configure
       run: cmake
            -G "${{ matrix.cmake_generator }}"
            ${{ matrix.cmake_options }}
            -DCMAKE_INSTALL_PREFIX=${{ matrix.install_dir }}
            -DCMAKE_BUILD_TYPE=${{ env.cmake_build_type }}
+           -DVCPKG_TARGET_TRIPLET=${{ matrix.vcpkg_triplet }}
            -DSKELETON=ON
            -DBUILD_TESTING=ON
            -DBUILD_EXAMPLES=ON