ntdll: Protect RtlAllocateHeap and RtlReAllocateHeap against integer overflows with large values of size.

[Robert Shearman]

Add tests for some of these boundary conditions.
---
  dlls/kernel32/tests/heap.c |    9 +++++++++
  dlls/ntdll/heap.c          |   32 +++++++++++++++++++++++++++++---
  2 files changed, 38 insertions(+), 3 deletions(-)

Try 2, changing the second parameter to safe_add to be signed.
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