unifdef-native: Convert to use do_install for staging

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

meta/packages/unifdef/unifdef-native_2.6.18+git.bb

@@ -10,11 +10,9 @@ do_compile() {
 	${CC} ${CFLAGS} ${LDFLAGS} -o unifdef ${WORKDIR}/unifdef.c
 }
 
-do_stage() {
+NATIVE_INSTALL_WORKS = "1"
+
+do_install() {
 	install -m 0755 unifdef ${STAGING_BINDIR}
 }
 
-do_install() {
-	:
-}
-