miniupnpd: added libcap-ng dependency

As miniupnpd is running as root, libcap(-ng) can be used to limit its
capabilities.

libcap-ng is very small, so this isn't a problem.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/miniupnpd/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=miniupnpd
 PKG_VERSION:=2.1.20200510
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_URL:=https://miniupnp.tuxfamily.org/files
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
@@ -28,7 +28,7 @@ include $(INCLUDE_DIR)/version.mk
 define Package/miniupnpd
   SECTION:=net
   CATEGORY:=Network
-  DEPENDS:=+iptables +libip4tc +IPV6:libip6tc +IPV6:ip6tables +libuuid
+  DEPENDS:=+iptables +libip4tc +IPV6:libip6tc +IPV6:ip6tables +libuuid +libcap-ng
   TITLE:=Lightweight UPnP IGD, NAT-PMP & PCP daemon
   SUBMENU:=Firewall
   URL:=https://miniupnp.tuxfamily.org/