zerotier: update to 1.6.1

Signed-off-by: Moritz Warning <moritzwarning@web.de>

net/zerotier/patches/0004-accept-external-linker-flags.patch

@@ -1,17 +1,17 @@
-From 5169e5328525af28f6b7de087ece10a9bc0a2282 Mon Sep 17 00:00:00 2001
+From 1a4ffe62c729f9c4f63cdfd26151e3724bc23f86 Mon Sep 17 00:00:00 2001
 From: Moritz Warning <moritzwarning@web.de>
 Date: Wed, 2 May 2018 16:06:46 +0200
-Subject: [PATCH 4/4] accept external linker flags
+Subject: [PATCH 4/8] accept external linker flags
 
 ---
  make-linux.mk | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/make-linux.mk b/make-linux.mk
-index fd164dfa..29ff8813 100644
+index b1bb638e..d358ecfb 100644
 --- a/make-linux.mk
 +++ b/make-linux.mk
-@@ -81,7 +81,7 @@ else
+@@ -77,7 +77,7 @@ else
  	override CFLAGS+=-Wall -Wno-deprecated -pthread $(INCLUDES) -DNDEBUG $(DEFS)
  	CXXFLAGS?=-O3 -fstack-protector
  	override CXXFLAGS+=-Wall -Wno-deprecated -std=c++11 -pthread $(INCLUDES) -DNDEBUG $(DEFS)
@@ -21,5 +21,5 @@ index fd164dfa..29ff8813 100644
  	STRIP+=--strip-all
  endif
 -- 
-2.22.0
+2.29.2