Fix compilation of Ruby plugin

The patch is created against root dir
/trunk/playground/devtools

First part for my summer of code.
-- 
Michaël Larouche
KDE developer working on Kopete, KDevelop4...on dial-up :P
--------------------------------------
Website: http://www.tehbisnatch.or
g/
MSN: michael.larouchekdemail.net
IRC: irc.freenode.org/DarkShock
Jabber/email: larouchekde.org

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