Suggested patch for FindOpenGL.cmake

[David Faure]

Why look for X11 again, if we did so already before?
[e.g. due to FindQt4.cmake]
This should save a bit of time in reconfiguring, since FindX11 has a rather large set of checks
(it's even larger in kde's version of it, due to additional libs), and since FindX11 doesn't have
a fast path when things are in the cache already (it rechecks every time).

-- 
David Faure, faure at kde.org, sponsored by Trolltech to work on KDE,
Konqueror (http://www.konqueror.org), and KOffice (http://www.koffice.org).
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