use portable printf instead of echo -e, needed for MacOS X buildhost

echo -e is not a portable way to do this, better use printf.
Works with MacOS X.

Signed-off-by: Waldemar Brodkorb <mail@waldemar-brodkorb.de>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

fs/common.mk

@@ -49,9 +49,9 @@ $(BINARIES_DIR)/rootfs.$(1): $(ROOTFS_$(2)_DEPENDENCIES)
 ifneq ($(ROOTFS_DEVICE_TABLES),)
 	cat $(ROOTFS_DEVICE_TABLES) > $(FULL_DEVICE_TABLE)
 ifeq ($(BR2_ROOTFS_DEVICE_CREATION_STATIC),y)
-	echo -e '$(subst $(sep),\n,$(PACKAGES_DEVICES_TABLE))' >> $(FULL_DEVICE_TABLE)
+	printf '$(subst $(sep),\n,$(PACKAGES_DEVICES_TABLE))' >> $(FULL_DEVICE_TABLE)
 endif
-	echo -e '$(subst $(sep),\n,$(PACKAGES_PERMISSIONS_TABLE))' >> $(FULL_DEVICE_TABLE)
+	printf '$(subst $(sep),\n,$(PACKAGES_PERMISSIONS_TABLE))' >> $(FULL_DEVICE_TABLE)
 	echo "$(HOST_DIR)/usr/bin/makedevs -d $(FULL_DEVICE_TABLE) $(TARGET_DIR)" >> $(FAKEROOT_SCRIPT)
 endif
 	echo "$(ROOTFS_$(2)_CMD)" >> $(FAKEROOT_SCRIPT)