message: added missing MFEM_USE_AMGX
diff: @@ -44,6 +44,7 @@ MFEM_USE_PUMI = @MFEM_USE_PUMI@
  MFEM_USE_HIOP = @MFEM_USE_HIOP@
  MFEM_USE_GSLIB = @MFEM_USE_GSLIB@
  MFEM_USE_CUDA = @MFEM_USE_CUDA@
  +MFEM_USE_AMGX = @MFEM_USE_AMGX@
  MFEM_USE_HIP = @MFEM_USE_HIP@
  MFEM_USE_RAJA = @MFEM_USE_RAJA@
  MFEM_USE_OCCA = @MFEM_USE_OCCA@
  