rssileds: add dependencies based on LDFLAGS

This adds the direct dependencies introduced by TARGET_LDFLAGS
to the package's DEPENDS variable.

This was found by accidentally building rssileds on octeon, which
resulted in:

"Package rssileds is missing dependencies for the following libraries:
libnl-tiny.so"

Though the dependencies are provided when building for the
relevant targets ar71xx, ath79 and ramips, it seems more tidy to
specify them explicitly.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
(cherry picked from commit a5b2c6f5edef1958d8789ff9bd89b408893b4358)

package/network/utils/rssileds/Makefile

@@ -18,7 +18,7 @@ define Package/rssileds
   SECTION:=net
   CATEGORY:=Network
   TITLE:=RSSI real-time LED indicator
-  DEPENDS:=+libiwinfo
+  DEPENDS:=+libiwinfo +libnl-tiny +libubox +libuci
   MAINTAINER:=Daniel Golle <dgolle@allnet.de>
 endef