Update to 5.0.5

* Fix build on Debian GNU/kFreeBSD 7.3
* Update MASTER_SITES

Changelog:
This is version 5.0.5 of the shell.  This is a stable release.
There are minor new features as well as bug fixes since 5.0.2.
5.0.3 and 5.0.4 were short-lived releases with most of the features of
5.0.5 that were replaced owing to significant bugs.

Incompatibilities between 5.0.2 and 5.0.5
-----------------------------------------

The "zshaddhistory" hook mechanism documented in the zshmisc manual page
has been upgraded so that a hook returning status 2 causes a history
line to be saved on the internal history list but not written to the
history file.  Previously any non-zero status return would cause
the line not to be saved on the history at all.  It is recommended
to use status 1 for this (indeed most shell users would naturally do
so).

(ryoon)