cmake Qt4 experiment in rawhide

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cmake's UseQt4 module automatically adds linkage for "dependent" modules when requesting certain module usage. This caused at least one case of over-linkage for plplot (linking in QtXml when it used QtSvg).

I've just built a new cmake for rawhide that completely disbles this functionality. This means that if a program makes direct use of a Qt module it would need to ask for it (e.g. with set(QT_USE_QTXML 1)).

I'm curious to know what if anything breaks with this. Please let me know if a package of yours no longer builds with this change. FWIW - I've rebuilt kdelibs and digikam locally as smoke tests with no problem. But I'll be happy to revert if it causes too much grief.

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Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA, Boulder/CoRA Office             FAX: 303-415-9702
3380 Mitchell Lane                       orion@xxxxxxxx
Boulder, CO 80301                   http://www.nwra.com
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