Bug #14181049: MYSQL_INSTALL_DB.PL CREATES EMPTY SYSTEM TABLES FOR MYSQL

  The script is different from what's used on unixes.
  It was not playing the table insertion script (mysql_system_tables_data.sql),
  although it was checking for the presence of this script.
  Fixed by re-enabling the lookup for this file and replaying it at bootstrap
  time. Note that on the Unixes "SELECT @@hostname" does return a fully qualified
  name, whereas on Windows it returns only a hostname.
  So by default we're filtering records in the mysql.user table until we ensure
  this is fixed.

The change was coded in 5.5 by Georgi Kodinov <Georgi.Kodinov@Oracle.com>