Hint at 'enable RPC' requirement for nfs-utils and portmap

package/nfs-utils/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_NFS_UTILS
 	bool "nfs-utils"
+	depends on BR2_INET_RPC
 	default n
 	help
 	  The NFS Linux kernel server.
@@ -8,6 +9,9 @@ config BR2_PACKAGE_NFS_UTILS
 
 	  http://sourceforge.net/projects/nfs
 
+comment "nfs-utils requires a toolchain with 'Enable RPC' selected"
+	depends on !BR2_INET_RPC
+
 menu "NFS utilities selection"
 	depends BR2_PACKAGE_NFS_UTILS
 

package/portmap/Config.in

@@ -1,7 +1,11 @@
 config BR2_PACKAGE_PORTMAP
 	bool "portmap"
 	default n
+	depends on BR2_INET_RPC
 	help
 	  The standard portmapper for RPC services.
 
 	  ftp://ftp.porcupine.org/pub/security/index.html
+
+comment "portmap requires a toolchain with 'Enable RPC' selected"
+	depends on !BR2_INET_RPC