Bring in Delphix enhancements to libofmt.

*** 30,44 ****
  
  $mapfile_version 2
  
  SYMBOL_VERSION ILLUMOSprivate {
      global:
          ofmt_close;
          ofmt_open;
          ofmt_print;
          ofmt_strerror;
          ofmt_update_winsize;
-         ofmt_check;
  
      local:
          *;
  };
--- 30,46 ----
  
  $mapfile_version 2
  
  SYMBOL_VERSION ILLUMOSprivate {
      global:
+         ofmt_check;
          ofmt_close;
          ofmt_open;
          ofmt_print;
+         ofmt_print_header;
+         ofmt_set_fs;
          ofmt_strerror;
          ofmt_update_winsize;
  
      local:
          *;
  };