net/zerotier: Fix source tarball filename

HTTP header content-disposition isn't honored resulting in source tarball name only containing version number.
Switch to GIT repo as workaround to avoid clashing filenames.

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

net/zerotier/Makefile

@@ -11,11 +11,13 @@ PKG_RELEASE:=4
 
 PKG_LICENSE:=GPL-3.0
 
-PKG_SOURCE:=$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=https://github.com/zerotier/ZeroTierOne/archive/
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL:=https://github.com/zerotier/ZeroTierOne
 PKG_SOURCE_SUBDIR:=ZeroTierOne-$(PKG_VERSION)
+PKG_SOURCE_VERSION:=ae491c277e6f35d1acbdcbf700e2b834957295ae
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_MIRROR_MD5SUM:=c8c3219c995a59161832d580a194f6280de7a4eef75cebece6f38400b64f003e
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_SOURCE_SUBDIR)
-PKG_MD5SUM:=5e381f0864797886b3b3bf20beb49bba
 
 PKG_BUILD_DEPENDS:=uclibcxx
 PKG_BUILD_PARALLEL:=1