remove broken url

packages/b/boost/xmake.lua

@@ -6,9 +6,6 @@ package("boost")
     add_urls("https://boostorg.jfrog.io/artifactory/main/release/$(version).tar.bz2", {version = function (version)
             return version .. "/source/boost_" .. (version:gsub("%.", "_"))
         end})
-    add_urls("https://dl.bintray.com/boostorg/release/$(version).tar.bz2", {version = function (version)
-            return version .. "/source/boost_" .. (version:gsub("%.", "_"))
-        end})
     add_urls("https://github.com/xmake-mirror/boost/releases/download/boost-$(version).tar.bz2", {version = function (version)
             return version .. "/boost_" .. (version:gsub("%.", "_"))
         end})