pull down the submodules

Author: Moros1138

.github/workflows/emscripten-build.yml

@@ -16,7 +16,9 @@ jobs:
     steps:
       - name: Checkout source code
         uses: actions/checkout@v3
-
+        with:
+          submodules: 'recursive'
+          
       - name: Set up Python (required for Emscripten)
         uses: actions/setup-python@v4
         with: