Remove unused headers.

code/OgreImporter.cpp

@@ -40,12 +40,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef ASSIMP_BUILD_NO_OGRE_IMPORTER
 
-
-
 #include "OgreImporter.h"
 #include "OgreBinarySerializer.h"
 #include "OgreXmlSerializer.h"
 #include <assimp/Importer.hpp>
+#include <assimp/importerdesc.h>
 #include <memory>
 
 static const aiImporterDesc desc = {