Update vendor dependencies

Change-Id: I3b1ca9f2687388c831d9d46a4e1de413ffae06ac

vendor/github.com/karrick/godirwalk/readdir_windows.go

@@ -0,0 +1,54 @@
+package godirwalk
+
+import (
+	"os"
+
+	"github.com/pkg/errors"
+)
+
+// The functions in this file are mere wrappers of what is already provided by
+// standard library, in order to provide the same API as this library provides.
+//
+// The scratch buffer argument is ignored by this architecture.
+//
+// Please send PR or link to article if you know of a more performant way of
+// enumerating directory contents and mode types on Windows.
+
+func readdirents(osDirname string, _ []byte) (Dirents, error) {
+	dh, err := os.Open(osDirname)
+	if err != nil {
+		return nil, errors.Wrap(err, "cannot Open")
+	}
+
+	fileinfos, err := dh.Readdir(0)
+	if er := dh.Close(); err == nil {
+		err = er
+	}
+	if err != nil {
+		return nil, errors.Wrap(err, "cannot Readdir")
+	}
+
+	entries := make(Dirents, len(fileinfos))
+	for i, info := range fileinfos {
+		entries[i] = &Dirent{name: info.Name(), modeType: info.Mode() & os.ModeType}
+	}
+
+	return entries, nil
+}
+
+func readdirnames(osDirname string, _ []byte) ([]string, error) {
+	dh, err := os.Open(osDirname)
+	if err != nil {
+		return nil, errors.Wrap(err, "cannot Open")
+	}
+
+	entries, err := dh.Readdirnames(0)
+	if er := dh.Close(); err == nil {
+		err = er
+	}
+	if err != nil {
+		return nil, errors.Wrap(err, "cannot Readdirnames")
+	}
+
+	return entries, nil
+}