android build: pin hashes of p4a recipes

contrib/android/p4a_recipes/cffi/__init__.py

@@ -0,0 +1,18 @@
+import os
+
+from pythonforandroid.recipes.cffi import CffiRecipe
+from pythonforandroid.util import load_source
+
+util = load_source('util', os.path.join(os.path.dirname(os.path.dirname(__file__)), 'util.py'))
+
+
+assert CffiRecipe._version == "1.13.2"
+assert CffiRecipe.depends == ['setuptools', 'pycparser', 'libffi', 'python3']
+assert CffiRecipe.python_depends == []
+
+
+class CffiRecipePinned(util.InheritedRecipeMixin, CffiRecipe):
+    sha512sum = "2c57d9c06c39e95498a54408dc39940427190f3c03e1b8f1a3584140db08a5775dd12e6e67b03093429c130af579d01519b0fc868b99ba7a530068ed22d38522"
+
+
+recipe = CffiRecipePinned()