DocBook XML & XSL: new dependencies

[Luigi Toscano]

Hi,
as I announced on kde-core-devel[1], I'm working to remove the embedded copies 
of XML and XSLT files from kdelibs/kdoctools. This process will introduce two 
external dependencies; I'd like to complete the migration before the release 
of 4.5, so the proposed Find*.cmake modules for kdelibs are attached to this 
mail, ready to be reviewed.
Apart from those new modules, I need to change also KDE4Macros.cmake (see the 
attached patch), but before doing it, I must change the code in kdoctools/ a bit.

[1]http://markmail.org/message/rp6gj6evd3zwgl3j

Regards,
-- 
Luigi
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