Remove vendor directory and add it to the ignore list

vendor/golang.org/x/sys/windows/svc/go12.c

@@ -1,24 +0,0 @@
-// Copyright 2012 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.
-
-// +build windows
-// +build !go1.3
-
-// copied from pkg/runtime
-typedef	unsigned int	uint32;
-typedef	unsigned long long int	uint64;
-#ifdef _64BIT
-typedef	uint64		uintptr;
-#else
-typedef	uint32		uintptr;
-#endif
-
-// from sys_386.s or sys_amd64.s
-void ·servicemain(void);
-
-void
-·getServiceMain(uintptr *r)
-{
-	*r = (uintptr)·servicemain;
-}