fix(git): add vendor in .gitignore

vendor/golang.org/x/sys/cpu/cpu_linux.go

@@ -1,16 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !386 && !amd64 && !amd64p32 && !arm64
-// +build !386,!amd64,!amd64p32,!arm64
-
-package cpu
-
-func archInit() {
-	if err := readHWCAP(); err != nil {
-		return
-	}
-	doinit()
-	Initialized = true
-}