File _service:tar_scm:_servicedata of Package vulkan-headers

<servicedata>
<service name="tar_scm">
                <param name="url">https://github.com/KhronosGroup/Vulkan-Headers.git</param>
              <param name="changesrevision">df274657d83f3bd8c77aef816c1cbf27352a948b</param></service></servicedata>