Add kdoctools class

Allows us to maintain the necessary bits in a single place, rather than
in multiple recipes in meta-kde.

classes/kdoctools.bbclass

@@ -0,0 +1,15 @@
+# Class for recipes using kdoctools to build their documentation
+
+do_compile_prepend() {
+    # meinproc5 needs to find installed service type files
+    export XDG_DATA_DIRS=${STAGING_DATADIR}:$XDG_DATA_DIRS
+    # meinproc5 needs to find its libraries
+    export LD_LIBRARY_PATH=${STAGING_LIBDIR_NATIVE}:$LD_LIBRARY_PATH
+}
+
+DEPENDS += " \
+    kdoctools \
+    kdoctools-native \
+    libxslt-native \
+    karchive-native \
+"