don't build readv for windows

common/buf/io.go

@@ -2,11 +2,8 @@ package buf
 
 import (
 	"io"
-	"runtime"
 	"syscall"
 	"time"
-
-	"v2ray.com/core/common/platform"
 )
 
 // Reader extends io.Reader with MultiBuffer.
@@ -50,16 +47,6 @@ func ReadAtLeastFrom(reader io.Reader, size int) Supplier {
 	}
 }
 
-var useReadv = false
-
-func init() {
-	const defaultFlagValue = "NOT_DEFINED_AT_ALL"
-	value := platform.NewEnvFlag("v2ray.buf.readv").GetValue(func() string { return defaultFlagValue })
-	if value != defaultFlagValue && (runtime.GOOS == "linux" || runtime.GOOS == "darwin") {
-		useReadv = true
-	}
-}
-
 // NewReader creates a new Reader.
 // The Reader instance doesn't take the ownership of reader.
 func NewReader(reader io.Reader) Reader {