rpcrt4: Fix NdrConformantStringUnmarshall to use buffer memory if possible.

[Robert Shearman]

---
  dlls/rpcrt4/ndr_marshall.c       |   25 ++++++++++++++++++++++++-
  dlls/rpcrt4/tests/ndr_marshall.c |    5 +----
  2 files changed, 25 insertions(+), 5 deletions(-)
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