add __tb_debug__ to tbox

packages/t/tbox/xmake.lua

@@ -11,6 +11,12 @@ package("tbox")
     add_versions("v1.6.2", "5236090b80374b812c136c7fe6b8c694418cbfc9c0a820ec2ba35ff553078c7b")
     add_versions("v1.6.3", "bc5a957cdb1610c19f0cf94497ad114a0e01fd7d569777e9cb2133c513ef6baa")
 
+    on_load(function (package) 
+        if package:debug() then
+            package:addvar("defines", "__tb_debug__")
+        end
+    end)
+
     on_install(function (package)
         import("package.tools.xmake").install(package, {demo = false})
     end)