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

lib/libc/string/strcpy.3

@@ -30,9 +30,9 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     from: @(#)strcpy.3	8.1 (Berkeley) 6/4/93
-.\"	$NetBSD: strcpy.3,v 1.20 2009/05/02 09:37:32 wiz Exp $
+.\"	$NetBSD: strcpy.3,v 1.23 2015/04/01 20:18:17 riastradh Exp $
 .\"
-.Dd May 1, 2009
+.Dd April 1, 2015
 .Dt STRCPY 3
 .Os
 .Sh NAME
@@ -92,6 +92,12 @@ Otherwise,
 is
 .Em not
 terminated.
+.Pp
+The strings
+.Fa src
+and
+.Fa dst
+may not overlap.
 .Sh RETURN VALUES
 The
 .Fn strcpy