NetBSD re-synchronization of the source tree

This brings our tree to NetBSD 7.0, as found on -current on the
10-10-2015.

This updates:
 - LLVM to 3.6.1
 - GCC to GCC 5.1
 - Replace minix/commands/zdump with usr.bin/zdump
 - external/bsd/libelf has moved to /external/bsd/elftoolchain/
 - Import ctwm
 - Drop sprintf from libminc

Change-Id: I149836ac18e9326be9353958bab9b266efb056f0

usr.bin/sort/sort.h

@@ -1,4 +1,4 @@
-/*	$NetBSD: sort.h,v 1.34 2011/09/16 15:39:29 joerg Exp $	*/
+/*	$NetBSD: sort.h,v 1.35 2015/08/05 07:10:03 mrg Exp $	*/
 
 /*-
  * Copyright (c) 2000-2003 The NetBSD Foundation, Inc.
@@ -103,9 +103,9 @@
 		err(2, "%p", file);					\
 }
 
-#define	EWRITE(ptr, size, n, f) {					\
+#define	EWRITE(ptr, size, n, f, fmt) {					\
 	if (!fwrite(ptr, size, n, f))					\
-		 err(2, NULL);						\
+		 err(2, fmt);						\
 }
 
 /* Records are limited to MAXBUFSIZE (8MB) and less if you want to sort