Another memory trim.

test/dw/dw_float_test.cc

@@ -1,3 +1,5 @@
+#include <memory>
+
 #include <FL/Fl.H>
 #include <FL/Fl_Window.H>
 
@@ -35,7 +37,7 @@ static void addTextToFloatTimeout (void *data)
 int main(int argc, char **argv)
 {
    FltkPlatform *platform = new FltkPlatform ();
-   Layout *layout = new Layout (platform);
+   auto layout = std::make_unique< Layout >( platform );
 
    Fl_Window *window = new Fl_Window(400, 600, "Dw Floats Example");
    window->begin();
@@ -139,7 +141,6 @@ int main(int argc, char **argv)
    int errorCode = Fl::run();
 
    wordStyle->unref();
-   delete layout;
 
    return errorCode;
 }