remove gsl, really

Author: luk036

bench/BM_lmi.cpp

@@ -1,7 +1,7 @@
-#include <ellalgo/cutting_plane.hpp>    // for cutting_plane_optim
-#include <ellalgo/ell.hpp>              // for Ell
-#include <ellalgo/ell_matrix.hpp>       // for Matrix
-#include <gsl/span>                     // for span
+#include <ellalgo/cutting_plane.hpp> // for cutting_plane_optim
+#include <ellalgo/ell.hpp>           // for Ell
+#include <ellalgo/ell_matrix.hpp>    // for Matrix
+// #include <gsl/span>                     // for span
 #include <lmisolver/lmi_old_oracle.hpp> // for LmiOldOracle
 #include <lmisolver/lmi_oracle.hpp>     // for LmiOracle
 #include <tuple>                        // for tuple