better handle p4a parent qt5 recipe

contrib/android/p4a_recipes/qt5/__init__.py

@@ -1,8 +1,16 @@
+import os
+
 from pythonforandroid.recipes.qt5 import Qt5Recipe
 
+from pythonforandroid.util import load_source
+
+util = load_source('util', os.path.join(os.path.dirname(os.path.dirname(__file__)), 'util.py'))
 
 assert Qt5Recipe._version == "9b43a43ee96198674060c6b9591e515e2d27c28f"
 assert Qt5Recipe.depends == ['python3']
 assert Qt5Recipe.python_depends == []
 
-recipe = Qt5Recipe()
+class Qt5RecipePinned(util.InheritedRecipeMixin, Qt5Recipe):
+    pass
+
+recipe = Qt5RecipePinned()