Platform: don't define ScreenedApplication for AndroidApplication.

Not done yet.

src/Magnum/Platform/AndroidApplication.cpp

@@ -253,7 +253,4 @@ void AndroidApplication::exec(android_app* state, std::unique_ptr<AndroidApplica
     state->userData = nullptr;
 }
 
-template class BasicScreen<AndroidApplication>;
-template class BasicScreenedApplication<AndroidApplication>;
-
 }}

src/Magnum/Platform/AndroidApplication.h

@@ -585,8 +585,6 @@ header is included this macro is also aliased to `MAGNUM_APPLICATION_MAIN()`.
 #ifndef DOXYGEN_GENERATING_OUTPUT
 #ifndef MAGNUM_APPLICATION_MAIN
 typedef AndroidApplication Application;
-typedef BasicScreen<AndroidApplication> Screen;
-typedef BasicScreenedApplication<AndroidApplication> ScreenedApplication;
 #define MAGNUM_APPLICATION_MAIN(className) MAGNUM_ANDROIDAPPLICATION_MAIN(className)
 #else
 #undef MAGNUM_APPLICATION_MAIN