make: unifdef for NSE (undefined)

*** 606,619 ****
          svr4_name = GETNAME(wcs_buffer, FIND_LENGTH);
          MBSTOWCS(wcs_buffer, NOCATGETS(".POSIX"));
          posix_name = GETNAME(wcs_buffer, FIND_LENGTH);
          MBSTOWCS(wcs_buffer, NOCATGETS(".DEFAULT"));
          default_rule_name = GETNAME(wcs_buffer, FIND_LENGTH);
- #ifdef NSE
-         MBSTOWCS(wcs_buffer, NOCATGETS(".DERIVED_SRC"));
-         derived_src= GETNAME(wcs_buffer, FIND_LENGTH);
- #endif
          MBSTOWCS(wcs_buffer, NOCATGETS("$"));
          dollar = GETNAME(wcs_buffer, FIND_LENGTH);
          MBSTOWCS(wcs_buffer, NOCATGETS(".DONE"));
          done = GETNAME(wcs_buffer, FIND_LENGTH);
          MBSTOWCS(wcs_buffer, NOCATGETS("."));
--- 606,615 ----
*** 692,704 ****
          /* Mark special targets so that the reader treats them properly */
          svr4_name->special_reader = svr4_special;
          posix_name->special_reader = posix_special;
          built_last_make_run->special_reader = built_last_make_run_special;
          default_rule_name->special_reader = default_special;
- #ifdef NSE
-         derived_src->special_reader= derived_src_special;
- #endif
          dot_keep_state->special_reader = keep_state_special;
          dot_keep_state_file->special_reader = keep_state_file_special;
          ignore_name->special_reader = ignore_special;
          make_version->special_reader = make_version_special;
          no_parallel_name->special_reader = no_parallel_special;
--- 688,697 ----