fix(zlib-dbg): 补 import stdio，f-string 需要 stdio 声明的 snprintf

ZlibDbg/App/main.vp

@@ -5,6 +5,7 @@ import zlib.zinflate as zinflate
 import zlib.zdef as zdef
 import string
 import stdlib
+import stdio
 import testcheck
 import t, c