Remove phys_map declaration, which is in <uvm/uvm_extern.h>.

From syssrc/sys/arch/news68k/news68k/vm_machdep.c:1.6.

sys/arch/x68k/x68k/vm_machdep.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: vm_machdep.c,v 1.32 2000/06/29 07:07:57 mrg Exp $	*/
+/*	$NetBSD: vm_machdep.c,v 1.33 2001/02/20 15:54:29 minoura Exp $	*/
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -280,8 +280,6 @@ kvtop(addr)
 	return((int)pa);
 }
 
-extern vm_map_t phys_map;
-
 /*
  * Map a user I/O request into kernel virtual address space.
  * Note: the pages are already locked by uvm_vslock(), so we