stubby: add missing dependency on ca-certificates

Signed-off-by: Tony Ambardar <itugrok@yahoo.com>

net/stubby/Makefile

@@ -42,7 +42,7 @@ define Package/stubby
 	SUBMENU:=IP Addresses and Names
 	TITLE+= - (daemon that uses getdns)
 	USERID:=stubby=410:stubby=410
-	DEPENDS:= +libyaml +getdns
+	DEPENDS:= +libyaml +getdns +ca-certificates
 endef
 
 define Package/stubby/install