Revert "Switch to new vendor directory layout"

This reverts commit d5742209d3.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

vendor/github.com/godbus/dbus/transport_darwin.go

@@ -1,6 +0,0 @@
-package dbus
-
-func (t *unixTransport) SendNullByte() error {
-	_, err := t.Write([]byte{0})
-	return err
-}