xinetd: fix build without RPC support

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/xinetd/Config.in

@@ -1,6 +1,5 @@
 config BR2_PACKAGE_XINETD
 	bool "xinetd"
-	depends on BR2_INET_RPC
 	help
 	  xinetd is a secure replacement for inetd. It was originally written by
 	  panos@cs.colorado.edu.

package/xinetd/xinetd.mk

@@ -7,4 +7,8 @@ XINETD_VERSION = 2.3.15
 XINETD_SOURCE  = xinetd-$(XINETD_VERSION).tar.gz
 XINETD_SITE    = http://www.xinetd.org
 
+ifneq ($(BR2_INET_RPC),y)
+XINETD_CONF_ENV = CFLAGS="$(TARGET_CFLAGS) -DNO_RPC"
+endif
+
 $(eval $(call AUTOTARGETS))