[CI] Test that ctypes_generation results can be executed

Author: hakril

.github/workflows/tests.yml

@@ -16,6 +16,8 @@ jobs:
             python-version: '3.11'
         - run:
             py .\ctypes_generation\generate.py
+        - name: Check generated code can execute
+            py -c "import windows.generated_def"
   tests:
     # Not a real dependency : but starting tests when ctypes generation is broken is not useful
     needs: generate_ctypes