package: libnftnl: Depend on libmnl

Signed-off-by: Phil Sutter <phil@nwl.cc>

package/libnftnl/Makefile

@@ -9,6 +9,8 @@ PKG_RELEASE:=		1
 PKG_HASH:=		607da28dba66fbdeccf8ef1395dded9077e8d19f2995f9a4d45a9c2f0bcffba8
 PKG_DESCR:=		low-level netlink programming interface to the in-kernel nf_tables subsystem
 PKG_SECTION:=		libs/misc
+PKG_DEPENDS:=		libmnl
+PKG_BUILDDEP:=		libmnl
 PKG_URL:=		https://www.netfilter.org/projects/libnftnl/index.html
 PKG_SITES:=		https://www.netfilter.org/projects/libnftnl/files/
 PKG_OPTS:=		dev