meta-digi-del: clean udev build warning

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-del/recipes-core/udev/udev_173.bbappend

@@ -6,3 +6,9 @@ PR_append = "+${DISTRO}"
 FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}-${PV}:"
 
 RRECOMMENDS_${PN} += "udev-extraconf"
+
+do_install_append() {
+	# Remove empty dir to clean build warning:
+	# QA Issue: udev: Files/directories were installed but not shipped
+	rmdir ${D}${sbindir}
+}