remove dead code

unsupported/Eigen/SparseExtra

@@ -29,29 +29,6 @@ namespace Eigen {
   * \endcode
   */
 
-struct DefaultBackend {};
-
-
-// solver flags
-enum {
-  CompleteFactorization       = 0x0000,  // the default
-  IncompleteFactorization     = 0x0001,
-  MemoryEfficient             = 0x0002,
-
-  // For LLT Cholesky:
-  SupernodalMultifrontal      = 0x0010,
-  SupernodalLeftLooking       = 0x0020,
-
-  // Ordering methods:
-  NaturalOrdering             = 0x0100, // the default
-  MinimumDegree_AT_PLUS_A     = 0x0200,
-  MinimumDegree_ATA           = 0x0300,
-  ColApproxMinimumDegree      = 0x0400,
-  Metis                       = 0x0500,
-  Scotch                      = 0x0600,
-  Chaco                       = 0x0700,
-  OrderingMask                = 0x0f00
-};
 
 #include "../../Eigen/src/misc/Solve.h"
 #include "../../Eigen/src/misc/SparseSolve.h"
@@ -62,10 +39,6 @@ enum {
 
 #include "src/SparseExtra/MarketIO.h"
 
-#include "src/SparseExtra/SparseLLT.h"
-#include "src/SparseExtra/SparseLDLTLegacy.h"
-#include "src/SparseExtra/SparseLU.h"
-
 } // namespace Eigen
 
 #include "../../Eigen/src/Core/util/ReenableStupidWarnings.h"