fix(git): add vendor in .gitignore

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

@@ -1,34 +0,0 @@
-// Copyright 2019 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 aix
-// +build aix
-
-package cpu
-
-const (
-	// getsystemcfg constants
-	_SC_IMPL     = 2
-	_IMPL_POWER8 = 0x10000
-	_IMPL_POWER9 = 0x20000
-)
-
-func archInit() {
-	impl := getsystemcfg(_SC_IMPL)
-	if impl&_IMPL_POWER8 != 0 {
-		PPC64.IsPOWER8 = true
-	}
-	if impl&_IMPL_POWER9 != 0 {
-		PPC64.IsPOWER8 = true
-		PPC64.IsPOWER9 = true
-	}
-
-	Initialized = true
-}
-
-func getsystemcfg(label int) (n uint64) {
-	r0, _ := callgetsystemcfg(label)
-	n = uint64(r0)
-	return
-}