Export QSSGRenderRay and QSSGLayerRenderHelper for testing

Change-Id: I1db82a60ee0a8f98bea4b13718edac886c0adfb4
Reviewed-by: Antti Määttä <antti.maatta@qt.io>

src/runtimerender/qssgrenderray_p.h

@@ -58,7 +58,7 @@ enum class QSSGRenderBasisPlanes
     XZ,
 };
 
-struct QSSGRenderRay
+struct Q_AUTOTEST_EXPORT QSSGRenderRay
 {
     QVector3D origin;
     QVector3D direction;

src/runtimerender/rendererimpl/qssgrendererimpllayerrenderhelper_p.h

@@ -63,7 +63,7 @@ QT_BEGIN_NAMESPACE
  *	I am using language level access control on this object because it needs specific
  *	interface design that will enable future modifications.
  */
-struct QSSGLayerRenderHelper
+struct Q_AUTOTEST_EXPORT QSSGLayerRenderHelper
 {
 private:
     QSSGRenderLayer *m_layer = nullptr;