build: Upstream split CONFIG_IFUPDOWN

In upstream commit a8c696bf09.

1 files changed, 1 insertions, 1 deletions

diff --git a/build b/build
index 8f63f44..8be616a 100755
--- a/build
+++ b/build
@@ -70,7 +70,7 @@ install: build
 	if config_enabled HTTPD; then \
 		install -d -m 0755 dest/var/www; \
 	fi; \
-	if config_enabled IFUPDOWN; then \
+	if config_enabled IFUP && config_enabled IFDOWN; then \
 		install -d -m 0755 dest/etc; \
 		for dir in '' if-pre-up.d if-up.d if-down.d if-post-down.d; do \
 			install -d -m 0755 "dest/etc/network/$${dir}"; \