openvpn: reduce binary size using --gc-sections on linking

Saves around 9kb gzipped on MIPS

Signed-off-by: Felix Fietkau <[email protected]>

package/network/services/openvpn/Makefile

@@ -65,6 +65,9 @@ CONFIGURE_VARS += \
 	IPROUTE=/sbin/ip \
 	NETSTAT=/sbin/netstat
 
+TARGET_CFLAGS += -ffunction-sections -fdata-sections
+TARGET_LDFLAGS += -Wl,--gc-sections
+
 define Build/Configure
 	$(call Build/Configure/Default, \
 		$(if $(CONFIG_OPENVPN_$(BUILD_VARIANT)_ENABLE_SMALL),--enable-small) \