BUG #6637: Casablanca timezone is wrong

The following bug has been logged on the website:

Bug reference:      6637
Logged by:          David Chuet
Email address:      dchuet@odotech.com
PostgreSQL version: 9.0.7
Operating system:   Windows 7 x64
Description:=20=20=20=20=20=20=20=20

Using Postgresql command :

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SELECT * FROM pg_timezone_names
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We get for Africa/Casablanca, timezone equal to WET with no DST.

This is not true from 2010.
See Wikipedia, for Morocco:

Time zone     WET (UTC+0)
Summer (DST)     WEST (UTC+1)(May 2nd to August 7th)

So, I cannot set correctly the DateTime for an install in Morocco.