Bring in Delphix enhancements to libofmt.

@@ -30,15 +30,17 @@
 
 $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;
-        ofmt_check;
 
     local:
         *;
 };