case-insensitive. (Bug #7989)


mysql-test/r/system_mysql_db.result:
  Update results
scripts/mysql_create_system_tables.sh:
  Need to create enum and set columns with case-insensitive collation
scripts/mysql_fix_privilege_tables.sql:
  Modify all enum and set columns to be case-insensitive (and re-order some of
  the fix-ups to make it all happen smoothly).