[source] swconfig: Link with libubox

[LEDE Commits]

florian pushed a commit to source.git, branch master:
https://git.lede-project.org/fe8618a8fe0db1bc8f343c0f75082ff96e9991ab

commit fe8618a8fe0db1bc8f343c0f75082ff96e9991ab
Author: Florian Fainelli <f.fainelli at gmail.com>
AuthorDate: Sun Feb 12 14:10:12 2017 -0800

    swconfig: Link with libubox
    
    Fixes linking failures observed with external toolchains:
    
    /home/florian/dev/toolchains/stbgcc-4.8-1.5/bin/../lib/gcc/mipsel-linux-gnu/4.8.5/../../../../mipsel-linux-gnu/bin/ld:
    warning: libubox.so, needed by
    /home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/usr/lib/libuci.so,
    not found (try using -rpath or -rpath-link)
    /home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/usr/lib/libuci.so:
    undefined reference to `blobmsg_open_nested'
    /home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/usr/lib/libuci.so:
    undefined reference to `blobmsg_parse'
    /home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/usr/lib/libuci.so:
    undefined reference to `blob_nest_end'
    /home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/usr/lib/libuci.so:
    undefined reference to `blobmsg_add_field'
    
    Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 package/network/config/swconfig/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/network/config/swconfig/Makefile b/package/network/config/swconfig/Makefile
index e4a00d6..e457ce4 100644
--- a/package/network/config/swconfig/Makefile
+++ b/package/network/config/swconfig/Makefile
@@ -34,7 +34,7 @@ define Build/Compile
 	CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \
 	$(MAKE) -C $(PKG_BUILD_DIR) \
 		$(TARGET_CONFIGURE_OPTS) \
-		LIBS="$(TARGET_LDFLAGS) -lnl-tiny -lm -luci"
+		LIBS="$(TARGET_LDFLAGS) -lnl-tiny -lm -luci -lubox"
 endef
 
 define Build/InstallDev