make FEATURE_HAVE_RPC auto-selectable by mount and inetd sub-features

diff --git a/util-linux/Config.in b/util-linux/Config.in
index 1040ce2..c910813 100644
--- a/util-linux/Config.in
+++ b/util-linux/Config.in
@@ -363,7 +363,8 @@
 config FEATURE_MOUNT_NFS
 	bool "Support mounting NFS file systems"
 	default n
-	depends on MOUNT && FEATURE_HAVE_RPC
+	depends on MOUNT
+	select FEATURE_HAVE_RPC
 	select FEATURE_SYSLOG
 	help
 	  Enable mounting of NFS file systems.