dropbear: add initial support for ECC host key

Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>

package/network/services/dropbear/Makefile

@@ -61,6 +61,7 @@ define Package/dropbear/description
 endef
 
 define Package/dropbear/conffiles
+$(if $(CONFIG_DROPBEAR_ECC),/etc/dropbear/dropbear_ecdsa_host_key)
 /etc/dropbear/dropbear_rsa_host_key
 /etc/config/dropbear
 endef
@@ -144,6 +145,7 @@ define Package/dropbear/install
 	$(INSTALL_BIN) ./files/dropbear.init $(1)/etc/init.d/dropbear
 	$(INSTALL_DIR) $(1)/usr/lib/opkg/info
 	$(INSTALL_DIR) $(1)/etc/dropbear
+	$(if $(CONFIG_DROPBEAR_ECC),touch $(1)/etc/dropbear/dropbear_ecdsa_host_key)
 	touch $(1)/etc/dropbear/dropbear_rsa_host_key
 endef