dnsmasq: allow building without tftp server support

It saves 2871 bytes on package size while 4 bytes on memory size.

Signed-off-by: Rosy Song <rosysong@rosinson.com>

package/network/services/dnsmasq/Makefile

@@ -30,7 +30,8 @@ PKG_CONFIG_DEPENDS:= CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_dhcp \
 	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_ipset \
 	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_conntrack \
 	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_noid \
-	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_broken_rtc
+	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_broken_rtc \
+	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_tftp
 
 include $(INCLUDE_DIR)/package.mk
 
@@ -115,6 +116,9 @@ define Package/dnsmasq-full/config
 	config PACKAGE_dnsmasq_full_broken_rtc
 		bool "Build with HAVE_BROKEN_RTC."
 		default n
+	config PACKAGE_dnsmasq_full_tftp
+		bool "Build with TFTP server support."
+		default y
 	endif
 endef
 
@@ -139,7 +143,8 @@ ifeq ($(BUILD_VARIANT),full)
 		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_ipset),,-DNO_IPSET) \
 		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_conntrack),-DHAVE_CONNTRACK,) \
 		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_noid),-DNO_ID,) \
-		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_broken_rtc),-DHAVE_BROKEN_RTC)
+		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_broken_rtc),-DHAVE_BROKEN_RTC) \
+		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_tftp),,-DNO_TFTP)
 	COPTS += $(if $(CONFIG_LIBNETTLE_MINI),-DNO_GMP,)
 else
 	COPTS += -DNO_AUTH -DNO_IPSET -DNO_ID