kde-base.bbclass: add libxml2-native to DEPENDS

Bacam necessary by [1] and its usage

[1] https://git.openembedded.org/openembedded-core/commit/meta/classes/xmlcatalog.bbclass?id=28c58cff76b24cea2745352c6557a81c04d85138

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

classes/kde-base.bbclass

@@ -19,6 +19,8 @@ SRC_URI = "${KDE_MIRROR}/stable/${BPN}/${PV}/src/${BPN}-${PV}.tar.xz"
 # extra-cmake-modules cause dependent to check for python
 inherit cmake_qt5_extra pythonnative
 
+DEPENDS += "libxml2-native"
+
 do_compile_prepend() {
     export XDG_DATA_HOME=${STAGING_DATADIR}
 }