ocserv: depend on certtool to allow key generation

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

net/ocserv/Makefile

@@ -33,7 +33,7 @@ define Package/ocserv
   TITLE:=OpenConnect VPN server
   URL:=http://www.infradead.org/ocserv/
   MAINTAINER:=Nikos Mavrogiannopoulos <n.mavrogiannopoulos@gmail.com>
-  DEPENDS:= +libgnutls +libncurses +libreadline +OCSERV_PAM:libpam +OCSERV_PROTOBUF:libprotobuf-c
+  DEPENDS:= +libgnutls +certtool +libncurses +libreadline +OCSERV_PAM:libpam +OCSERV_PROTOBUF:libprotobuf-c
 endef
 
 define Package/ocserv/description