api-impl: add stubs / simple stuff for OsmAnd

without native libs present, launches and renders white square
in map view; with native libs present, segfaults in bundled skia

src/api-impl/android/os/Environment.java

@@ -93,6 +93,10 @@ public class Environment {
 		}
 	}
 
+	public static boolean isExternalStorageRemovable(File file) {
+		return true;
+	}
+
 	/**
 	 * {@hide}
 	 */