github: fix installdir for sibling xo deps

.github/workflows/cmake-single-platform.yml

@@ -70,13 +70,11 @@ jobs:
 
     - name: Checkout reflect
       uses: actions/checkout@v3
-      with:
-        submodules: true
 
     - name: Configure reflect
       # 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 -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_PREFIX_PATH=${{github.workspace}}/local -DCMAKE_INSTALL_PREFIX=${{github.workspace}}/local -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
 
     - name: Build reflect
       # Build your program with the given configuration