Fix clang16 compiler warnings

Fixes the following two warnings:

preconditioner.h:64:11: warning: field 'f_block_size' will be initialized after field 'elimination_groups' [-Wreorder-ctor]
block_sparse_matrix.cc:70:19: warning: unused parameter 'values' [-Wunused-parameter]

Change-Id: I5cc55ca387b3f12259096c1531c263279650bd49

internal/ceres/block_sparse_matrix.cc

diff --git a/internal/ceres/block_sparse_matrix.cc b/internal/ceres/block_sparse_matrix.cc
index 909389c..2efee39 100644
--- a/internal/ceres/block_sparse_matrix.cc
+++ b/internal/ceres/block_sparse_matrix.cc
@@ -67,7 +67,6 @@
 template <bool transpose>
 std::unique_ptr<CompressedRowSparseMatrix>
 CreateStructureOfCompressedRowSparseMatrix(
-    const double* values,
     int num_rows,
     int num_cols,
     int num_nonzeros,
@@ -451,7 +450,7 @@
 BlockSparseMatrix::ToCompressedRowSparseMatrixTranspose() const {
   auto bs = transpose_block_structure_.get();
   auto crs_matrix = CreateStructureOfCompressedRowSparseMatrix<true>(
-      values(), num_cols_, num_rows_, num_nonzeros_, bs);
+      num_cols_, num_rows_, num_nonzeros_, bs);
 
   SetBlockStructureOfCompressedRowSparseMatrix(crs_matrix.get(), bs);
 
@@ -462,7 +461,7 @@
 std::unique_ptr<CompressedRowSparseMatrix>
 BlockSparseMatrix::ToCompressedRowSparseMatrix() const {
   auto crs_matrix = CreateStructureOfCompressedRowSparseMatrix<false>(
-      values(), num_rows_, num_cols_, num_nonzeros_, block_structure_.get());
+      num_rows_, num_cols_, num_nonzeros_, block_structure_.get());
 
   SetBlockStructureOfCompressedRowSparseMatrix(crs_matrix.get(),
                                                block_structure_.get());

internal/ceres/preconditioner.h

diff --git a/internal/ceres/preconditioner.h b/internal/ceres/preconditioner.h
index 07a7b1f..42dc6cc 100644
--- a/internal/ceres/preconditioner.h
+++ b/internal/ceres/preconditioner.h
@@ -59,10 +59,10 @@
           sparse_linear_algebra_library_type(
               linear_solver_options.sparse_linear_algebra_library_type),
           num_threads(linear_solver_options.num_threads),
+          elimination_groups(linear_solver_options.elimination_groups),
           row_block_size(linear_solver_options.row_block_size),
           e_block_size(linear_solver_options.e_block_size),
           f_block_size(linear_solver_options.f_block_size),
-          elimination_groups(linear_solver_options.elimination_groups),
           context(linear_solver_options.context) {}
 
     PreconditionerType type = JACOBI;