android build: pin hashes of p4a recipes

contrib/android/p4a_recipes/cryptography/__init__.py

@@ -0,0 +1,13 @@
+from pythonforandroid.recipes.cryptography import CryptographyRecipe
+
+
+assert CryptographyRecipe._version == "2.8"
+assert CryptographyRecipe.depends == ['openssl', 'six', 'setuptools', 'cffi', 'python3']
+assert CryptographyRecipe.python_depends == []
+
+
+class CryptographyRecipePinned(CryptographyRecipe):
+    sha512sum = "000816a5513691bfbb01c5c65d96fb3567a5ff25300da4b485e716b6d4dc789aec05ed0fe65df9c5e3e60127aa9110f04e646407db5b512f88882b0659f7123f"
+
+
+recipe = CryptographyRecipePinned()