Fix broken meinproc4 based docbook generating by already used xsltproc
Using xsltproc helps to reduce manual editing of xml doc and avoids cyclic dependency (kdelibs depends on dbus and dbus depends on kdelibs). It is available on all platforms (in the opposite to xmlto) and supports freedesktop CI out of the box. This commit adds docbook-xml and docbook-xsl as new dependency for cmake and removes obsolate xmlto support, which depends on xsltproc.
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