Add msbuild to path.

.github/workflows/main.yml

@@ -81,9 +81,12 @@ jobs:
         mv mpv.def libmpv.dll.a mpv/
         mv mpv build/
       shell: bash
+    - name: Add msbuild to PATH
+      uses: microsoft/setup-msbuild@v1.0.2
     - name: Build
       run: |
         cd build
+        $env:Path += ";C:\Program Files (x86)\WiX Toolset v3.11\bin"
         cmake -GNinja -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=output -DCMAKE_MAKE_PROGRAM=ninja.exe -DQTROOT=Qt/5.15.2/msvc2019_64 -DMPV_INCLUDE_DIR=mpv/include -DMPV_LIBRARY=mpv/mpv.dll -DCMAKE_INSTALL_PREFIX=output ..
         lib /def:mpv\mpv.def /out:mpv\mpv.dll.lib /MACHINE:X64
         ninja