Allow Android platforms to read from .apk files via the RWOPS interface.

Fixes Bugzilla #1261.

Thanks to Tim Angus for the patch!

android-project/src/org/libsdl/app/SDLActivity.java

@@ -114,6 +114,10 @@ public class SDLActivity extends Activity {
         mSingleton.sendCommand(COMMAND_CHANGE_TITLE, title);
     }
 
+	public static Context getContext() {
+		return mSingleton;
+	}
+
     // Audio
     private static Object buf;