msvcrt: Rework wcsncpy_s to work on overlapping pointers

[Piotr Caban]

---
  dlls/msvcrt/tests/string.c |   10 ++++++++++
  dlls/msvcrt/wcs.c          |   32 +++++++++++++++++++-------------
  2 files changed, 29 insertions(+), 13 deletions(-)


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