Revert "enable readv reader on windows"
Revert "enable readv reader on windows"

This reverts commit 4bd1ef0650ccaeb69e67e660769a35ce6d7ce942.

simpleman1984/v2ray-core,panzer13/v2ray-core,LiuWenJu/v2ray-core,simpleman1984/v2ray-core,v2ray/v2ray-core,simpleman1984/v2ray-core,panzer13/v2ray-core,LiuWenJu/v2ray-core,v2ray/v2ray-core