rpcrt4: Implement I_RpcMapWin32Status.

[Robert Shearman]

Add a test for this function.
---
  dlls/rpcrt4/rpcrt4_main.c |  123 
++++++++++++++++++++++++++++++++++++++++++-
  dlls/rpcrt4/tests/rpc.c   |  127 
+++++++++++++++++++++++++++++++++++++++++++++
  2 files changed, 248 insertions(+), 2 deletions(-)
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