Add submodule update.

.github/workflows/ccpp.yml

@@ -47,7 +47,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    
+      with:
+          submodules: true
+          
     - uses: lukka/get-cmake@latest
     
     - uses: ilammy/msvc-dev-cmd@v1