android build: pin hashes of p4a recipes

contrib/android/p4a_recipes/kivy/__init__.py

@@ -0,0 +1,18 @@
+from pythonforandroid.recipes.kivy import KivyRecipe
+
+
+assert KivyRecipe.depends == ['sdl2', 'pyjnius', 'setuptools', 'python3']
+assert KivyRecipe.python_depends == ['certifi']
+
+
+class KivyRecipePinned(KivyRecipe):
+    # kivy master 2020-12-10 (2.0.0 plus a few bugfixes)
+    version = "2debbc3b1484b14824112986cb03b1072a60fbfc"
+    sha512sum = "6cabb77860e63059ab4b0663b87f6396fa9133839b42db754628fc9a55f10b8d759466110e0763fd8dac40a49a03af276cb93b05076471d12db796e679f33d1d"
+
+    # mv "python_depends" into "depends" to ensure we can control what versions get installed
+    depends = [*KivyRecipe.depends, *KivyRecipe.python_depends]
+    python_depends = []
+
+
+recipe = KivyRecipePinned()