Fix missing vendor dir

vendor/github.com/tklauser/go-sysconf/sysconf.go

@@ -0,0 +1,21 @@
+// Copyright 2018 Tobias Klauser. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sysconf implements the sysconf(3) function and provides the
+// associated SC_* constants to query system configuration values.
+package sysconf
+
+import "errors"
+
+//go:generate go run mksysconf.go
+
+var errInvalid = errors.New("invalid parameter value")
+
+// Sysconf returns the value of a sysconf(3) runtime system parameter.
+// The name parameter should be a SC_* constant define in this package. The
+// implementation is GOOS-specific and certain SC_* constants might not be
+// defined for all GOOSes.
+func Sysconf(name int) (int64, error) {
+	return sysconf(name)
+}