[openwrt/openwrt] imagebuilder: fix reference to removed VERSION_SED variable

[LEDE Commits]

jow pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/fd30187c873868aa7bfea0d3402022164e09af49

commit fd30187c873868aa7bfea0d3402022164e09af49
Author: Jo-Philipp Wich <jo at mein.io>
AuthorDate: Fri Feb 2 14:39:23 2018 +0100

    imagebuilder: fix reference to removed VERSION_SED variable
    
    Fixes: ff8e9a4ecb ("treewide: combine VERSION_SED and VERSION_SED_SCRIPT")
    Signed-off-by: Jo-Philipp Wich <jo at mein.io>
---
 target/imagebuilder/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/imagebuilder/Makefile b/target/imagebuilder/Makefile
index 6ce57f3..418cf59 100644
--- a/target/imagebuilder/Makefile
+++ b/target/imagebuilder/Makefile
@@ -44,7 +44,7 @@ endif
 	echo '## This is the local package repository, do not remove!' >> $(PKG_BUILD_DIR)/repositories.conf
 	echo 'src imagebuilder file:packages'                          >> $(PKG_BUILD_DIR)/repositories.conf
 
-	$(VERSION_SED) $(PKG_BUILD_DIR)/repositories.conf
+	$(VERSION_SED_SCRIPT) $(PKG_BUILD_DIR)/repositories.conf
 
 ifeq ($(CONFIG_IB_STANDALONE),)
 	(cd $(call FeedPackageDir,libc); $(FIND) -type f -name 'libc_*.ipk' -or -name 'kernel_*.ipk' -or -name 'kmod-*.ipk') | \