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

tools/llvm/Makefile

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.17 2013/09/02 14:34:57 joerg Exp $
+#	$NetBSD: Makefile,v 1.20 2015/03/05 10:22:25 joerg Exp $
 
 .include <bsd.init.mk>
 
@@ -15,8 +15,8 @@ config/config.status: ${LLVM_SRCDIR}/configure
 	mkdir -p config
 	printf '#!/bin/sh\necho 2.7.3' > config/python
 	chmod 755 config/python
-	cd config && ${LLVM_SRCDIR}/configure ${LLVM_CONFIGURE_ARGS} \
-	    --enable-optimized CC=${HOST_CC:Q} \
+	cd config && ${HOST_SH} ${LLVM_SRCDIR}/configure ${LLVM_CONFIGURE_ARGS} \
+	    --enable-optimized CC=${HOST_CC:Q} CXX=${HOST_CXX:Q} \
 	    --with-python=${.OBJDIR}/config/python
 # --disable-assertions
 
@@ -43,7 +43,7 @@ CLEANFILES+=	need-dl need-dl.c need-dl.out need-terminfo need-terminfo.c need-te
 
 cleandir: cleandir-llvm
 
-cleandir-llvm:
+cleandir-llvm: .PHONY
 	test ! -d config || rm -r config
 	rm -f need-dl need-dl.tmp