message: Update CMakeLists.txt
  I did reorder.
diff: @@ -5,9 +5,10 @@ set(SOURCES
  matrix/ell_kernels.cpp
  preconditioner/block_jacobi_kernels.cpp
  solver/bicgstab_kernels.cpp
  - solver/fcg_kernels.cpp
  + solver/cg_kernels.cpp
  solver/cgs_kernels.cpp
  - solver/cg_kernels.cpp)
  + solver/fcg_kernels.cpp)
  +
  add_library(ginkgo_cpu SHARED
  $<TARGET_OBJECTS:ginkgo_cpu_device>
  