Add mingw to PATH on windows

.github/workflows/build_natives.yml

@@ -40,11 +40,6 @@ jobs:
     # You can convert this to a matrix build if you need cross-platform coverage.
     # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
     runs-on: windows-latest
-
-    defaults:
-      run:
-        shell: bash
-
     steps:
     - uses: actions/checkout@v3
       with:
@@ -55,10 +50,13 @@ jobs:
         distribution: 'adopt' # See 'Supported distributions' for available options
         java-version: '8'
 
+    - name: Add MingW64 to PATH
+      run: Add-Content $env:GITHUB_PATH "C:\msys64\mingw64\bin"
+
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
       # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
-      run: cmake .
+      run: cmake . -DCMAKE_CXX_COMPILER=g++
 
     - name: Build
       # Build your program with the given configuration