Revert ":arrow_up: Upgrades ZeroTier One to 1.6.0"

This reverts commit 92a49b7.

zerotier/Dockerfile

@@ -5,6 +5,9 @@ FROM ${BUILD_FROM}
 # Set shell
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
+# We need to copy in the patches need during build
+COPY rootfs/patches /patches
+
 # Setup base
 # hadolint ignore=DL3003
 RUN \
@@ -17,10 +20,11 @@ RUN \
         libgcc=9.3.0-r2 \
         libstdc++=9.3.0-r2 \
     \
-    && git clone --branch "1.6.0" --depth=1 \
+    && git clone --branch "1.4.6" --depth=1 \
         "https://github.com/zerotier/ZeroTierOne.git" /tmp/zerotier \
     \
     && cd /tmp/zerotier \
+    && patch -p1 < /patches/ZeroTierOne/gcc9-compat.patch \
     && make \
     && make install \
     \

zerotier/rootfs/patches/ZeroTierOne/gcc9-compat.patch

@@ -0,0 +1,21 @@
+diff --git a/make-linux.mk b/make-linux.mk
+index 9fd4f7b9..c409ce0b 100644
+--- a/make-linux.mk
++++ b/make-linux.mk
+@@ -260,12 +260,12 @@ endif
+ # ARM32 hell -- use conservative CFLAGS
+ ifeq ($(ZT_ARCHITECTURE),3)
+ 	ifeq ($(shell if [ -e /usr/bin/dpkg ]; then dpkg --print-architecture; fi),armel)
+-		override CFLAGS+=-march=armv5 -mfloat-abi=soft -msoft-float -mno-unaligned-access -marm
+-		override CXXFLAGS+=-march=armv5 -mfloat-abi=soft -msoft-float -mno-unaligned-access -marm
++		override CFLAGS+=-march=armv6 -mfloat-abi=soft -msoft-float -mno-unaligned-access -marm
++		override CXXFLAGS+=-march=armv6 -mfloat-abi=soft -msoft-float -mno-unaligned-access -marm
+ 		ZT_USE_ARM32_NEON_ASM_CRYPTO=0
+ 	else
+-		override CFLAGS+=-march=armv5 -mno-unaligned-access -marm -fexceptions
+-		override CXXFLAGS+=-march=armv5 -mno-unaligned-access -marm -fexceptions
++		override CFLAGS+=-march=armv6 -mno-unaligned-access -marm -fexceptions
++		override CXXFLAGS+=-march=armv6 -mno-unaligned-access -marm -fexceptions
+ 		ZT_USE_ARM32_NEON_ASM_CRYPTO=0
+ 	endif
+ endif