TextureTools: no need to include Vector2.h in Atlas.h.

While it's needed to call basically any useful function in there, its
definition isn't needed to create an instance of the AtlasLandfill
class, and that's what mainly matters.

src/Magnum/TextureTools/Atlas.h

@@ -32,10 +32,11 @@
 #include <Corrade/Containers/Pointer.h>
 
 #include "Magnum/Magnum.h"
-#include "Magnum/Math/Vector2.h"
 #include "Magnum/TextureTools/visibility.h"
 
 #ifdef MAGNUM_BUILD_DEPRECATED
+#include "Magnum/Math/Vector2.h"
+
 #include <Corrade/Utility/Macros.h>
 #include <Corrade/Utility/StlForwardVector.h>
 #endif