rpcrt4: Introduce a new function, safe_multiply, which will raise an exception if a multiply overflows a 4-byte integer.

[Robert Shearman]

This will protect the unmarshaling code against attacks specifying a 
large variance.

Use this new function in the conformant string functions to harden them 
against attack.

---

  dlls/rpcrt4/ndr_marshall.c |   61 
+++++++++++++++++++++++++++++++++++---------
  1 files changed, 49 insertions(+), 12 deletions(-)

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