[source] opkg: fix PKG_CONFIG_DEPENDS to include version.mk entries

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/d2e96d55ab071fddac46001d308ce834070bba2c

commit d2e96d55ab071fddac46001d308ce834070bba2c
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Thu Dec 14 09:39:18 2017 +0100

    opkg: fix PKG_CONFIG_DEPENDS to include version.mk entries
    
    Including version.mk sets PKG_CONFIG_DEPENDS to config entries used for
    VERSION_SED command. We should keep these configs to make sure package
    gets refreshed when needed.
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 package/system/opkg/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/system/opkg/Makefile b/package/system/opkg/Makefile
index 7b49a3b..76557f3 100644
--- a/package/system/opkg/Makefile
+++ b/package/system/opkg/Makefile
@@ -23,7 +23,8 @@ PKG_LICENSE_FILES:=COPYING
 
 PKG_MAINTAINER:=Jo-Philipp Wich <jo at mein.io>
 
-PKG_CONFIG_DEPENDS := \
+# Extend depends from version.mk
+PKG_CONFIG_DEPENDS += \
 	CONFIG_SIGNED_PACKAGES \
 	CONFIG_TARGET_INIT_PATH