Bug #38483 Federated storage engine NOT disabled as stated in release note

Description:
The release note for 5.0.64 states:

 The FEDERATED storage engine is now disabled by default
 in binary distributions. The engine is still available
 and can be enabled by starting the server with the
 --federated option. (Bug#37069)

Without any startup options, "SHOW ENGINES" returns "FEDERATED | YES",
and "show variables" returns "have_federated_engine | YES".

With "--skip-federated" option, they shows "DISABLED".

The binaries affected are (maybe some more):
5.0.64 and 5.0.66a for RHEL5 (x86, rpm)
5.0.66a for Windows (x86, with installer)

How to repeat:
install any of the affected binaries
execute 

SHOW ENGINES

Suggested fix:
disable the federated engine properly as stated in the release note

In 5.0, federated is only disabled in the my.cnf files that we ship. In 5.1, the default of the server has changed to disable federated.

Noted in 5.0.64 changelog.

The FEDERATED storage engine is now disabled by default in the .cnf
files shipped with MySQL distributions (my-huge.cnf, my-medium.cnf,
and so forth). This affects server behavior only if you install one
of these files.