Add a function to provide the list of third-party directories which are incompatible with Android

tools/licenses.py

Index: tools/licenses.py
diff --git a/tools/licenses.py b/tools/licenses.py
index d4140f8f3d9d326a421913031e2025b71efe497e..b8bdd5ccce555e6f36066ca8ab0adad292fe94cf 100755
--- a/tools/licenses.py
+++ b/tools/licenses.py
@@ -109,6 +109,7 @@ SPECIAL_CASES = {
         "Name": "open-vcdiff",
         "URL": "http://code.google.com/p/open-vcdiff",
         "License": "Apache 2.0, MIT, GPL v2 and custom licenses",
+        "Android Compatibility": "yes",
     },
     os.path.join('testing', 'gmock'): {
         "Name": "gmock",
@@ -247,7 +248,7 @@ def ParseDir(path):
 
     # Relative path to a file containing some html we're required to place in
     # about:credits.
-    optional_keys = ["Required Text"]
+    optional_keys = ["Required Text", "Android Compatibility"]
 
     if path in SPECIAL_CASES:
         metadata.update(SPECIAL_CASES[path])