Add osutil.Glob to deal with Windows (fixes #1690)

internal/osutil/glob_unix.go

@@ -0,0 +1,17 @@
+// Copyright (C) 2015 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// +build !windows
+
+package osutil
+
+import (
+	"path/filepath"
+)
+
+func Glob(pattern string) (matches []string, err error) {
+	return filepath.Glob(pattern)
+}