Fix missing vendor dir

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

@@ -0,0 +1,45 @@
+// Copyright 2021 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.
+
+//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd
+
+package sysconf
+
+import "os"
+
+func sysconfGeneric(name int) (int64, error) {
+	// POSIX default values
+	if sc, err := sysconfPOSIX(name); err == nil {
+		return sc, nil
+	}
+
+	switch name {
+	case SC_BC_BASE_MAX:
+		return _BC_BASE_MAX, nil
+	case SC_BC_DIM_MAX:
+		return _BC_DIM_MAX, nil
+	case SC_BC_SCALE_MAX:
+		return _BC_SCALE_MAX, nil
+	case SC_BC_STRING_MAX:
+		return _BC_STRING_MAX, nil
+	case SC_COLL_WEIGHTS_MAX:
+		return _COLL_WEIGHTS_MAX, nil
+	case SC_EXPR_NEST_MAX:
+		return _EXPR_NEST_MAX, nil
+	case SC_HOST_NAME_MAX:
+		return _HOST_NAME_MAX, nil
+	case SC_LINE_MAX:
+		return _LINE_MAX, nil
+	case SC_LOGIN_NAME_MAX:
+		return _LOGIN_NAME_MAX, nil
+	case SC_PAGESIZE: // same as SC_PAGE_SIZE
+		return int64(os.Getpagesize()), nil
+	case SC_RE_DUP_MAX:
+		return _RE_DUP_MAX, nil
+	case SC_SYMLOOP_MAX:
+		return _SYMLOOP_MAX, nil
+	}
+
+	return -1, errInvalid
+}