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

include/ssp/string.h

@@ -1,4 +1,4 @@
-/*	$NetBSD: string.h,v 1.9 2013/11/07 02:00:54 christos Exp $	*/
+/*	$NetBSD: string.h,v 1.13 2014/11/29 13:23:48 pooka Exp $	*/
 
 /*-
  * Copyright (c) 2006 The NetBSD Foundation, Inc.
@@ -31,6 +31,7 @@
 #ifndef _SSP_STRING_H_
 #define _SSP_STRING_H_
 
+#include <sys/cdefs.h>
 #include <ssp/ssp.h>
 
 __BEGIN_DECLS
@@ -82,6 +83,9 @@ __ssp_bos_icheck3_restrict(memcpy, void *, const void *)
 __ssp_bos_icheck3(memmove, void *, const void *)
 __ssp_bos_icheck3(memset, void *, int)
 __ssp_bos_icheck2_restrict(stpcpy, char *, const char *)
+#if __GNUC_PREREQ__(4,8) || defined(__clang__)
+__ssp_bos_icheck3_restrict(stpncpy, char *, const char *)
+#endif
 __ssp_bos_icheck2_restrict(strcpy, char *, const char *)
 __ssp_bos_icheck2_restrict(strcat, char *, const char *)
 __ssp_bos_icheck3_restrict(strncpy, char *, const char *)
@@ -92,6 +96,9 @@ __END_DECLS
 #define memmove(dst, src, len) __ssp_bos_check3(memmove, dst, src, len)
 #define memset(dst, val, len) __ssp_bos_check3(memset, dst, val, len)
 #define stpcpy(dst, src) __ssp_bos_check2(stpcpy, dst, src)
+#if __GNUC_PREREQ__(4,8) || defined(__clang__)
+#define stpncpy(dst, src, len) __ssp_bos_check3(stpncpy, dst, src, len)
+#endif
 #define strcpy(dst, src) __ssp_bos_check2(strcpy, dst, src)
 #define strcat(dst, src) __ssp_bos_check2(strcat, dst, src)
 #define strncpy(dst, src, len) __ssp_bos_check3(strncpy, dst, src, len)