busybox: Added helper to make the choice of settings less wordy

pkg_conf/busybox.conf

@@ -16,11 +16,23 @@
 # don't forget to unset this later
 BB_MNEMOSYNE_DIR="$base/target/$SDECFG_TRG_MNEMOSYNE/busybox"
 
-var_append conffiles ' ' $BB_MNEMOSYNE_DIR/mnemosyne.config
+bb_mnemosyne_append()
+{
+	local x=
+	for x; do
+		if [ -s "$BB_MNEMOSYNE_DIR/$x.config" ]; then
+			var_append conffiles ' ' $BB_MNEMOSYNE_DIR/$x.config
+		fi
+	done
+}
+
+# mnemosyne generics
+bb_mnemosyne_append mnemosyne
 
 case "$SDECFG_TRG_MNEMOSYNE_FOOTPRINT" in
-	embedded)	var_append conffiles ' ' $BB_MNEMOSYNE_DIR/embedded.config
+	embedded)	bb_mnemosyne_append embedded
 			;;
 esac
 
+unset bb_mnemosyne_append
 unset BB_MNEMOSYNE_DIR