Don't need x86_stub.c here, we'll pick it up from files.x86.

sys/arch/amd64/conf/files.amd64

@@ -1,4 +1,4 @@
-#	$NetBSD: files.amd64,v 1.70 2011/04/03 22:29:26 dyoung Exp $
+#	$NetBSD: files.amd64,v 1.71 2011/04/04 21:35:31 dyoung Exp $
 #
 # new style config file for amd64 architecture
 #
@@ -111,9 +111,6 @@ file	arch/x86/isa/rtc.c			isa
 # TSC timecounter support
 file	arch/x86/x86/tsc.c
 
-# Stubs for x86 routines not included in the system
-file	arch/x86/x86/x86_stub.c
-
 # attribute used to represent the "keyboard controller"
 # XXX should be a real device
 define	pckbcport { [irq = -1], [port = -1] }