kdoctools-native: rework DEPENDS

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>

recipes-kde/kf5/tier2/kdoctools/kdoctools-native.bb

@@ -2,7 +2,15 @@ require ${BPN}.inc
 
 inherit native cmake_lib
 
-DEPENDS += "libxslt-native libxml2-native karchive-native ki18n-native liburi-perl-native"
+DEPENDS += " \
+    libxslt-native \
+    libxml2-native \
+    karchive-native \
+    ki18n-native \
+    liburi-perl-native \
+    docbook-xml-dtd4-native \
+    docbook-xsl-stylesheets-native \
+"
 
 SRC_URI += " \
 	file://0003-don-t-build-documentation.patch \