Patch to copy dirs

It turns out that while xcopy works for Win32, you can't run it as a
service because you don't have a window. This patch adds a Win32
version of 'cp' as copydir.

Applied.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
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