update depot tools (#969)

* Update xmake.lua

* Update xmake.lua

packages/d/depot_tools/xmake.lua

@@ -9,6 +9,7 @@ package("depot_tools")
 
     on_load(function (package)
         package:addenv("PATH", ".")
+        package:addenv("PATH", "python-bin")
         package:addenv("DEPOT_TOOLS_UPDATE", "0")
         package:addenv("DEPOT_TOOLS_METRICS", "0")
     end)
@@ -24,5 +25,7 @@ package("depot_tools")
   end)
 
     on_test(function (package)
+        os.vrun("python3 --version")
+        os.vrun("ninja --version")
         os.vrunv(package:is_plat("windows") and "gclient.bat" or "gclient", {"--version"})
     end)