shlwapi: Don't crash in PathStripPath when read-only string is passed and it's not modified

[Piotr Caban]

Signed-off-by: Piotr Caban <piotr at codeweavers.com>
---
  dlls/shlwapi/path.c       |  4 ++--
  dlls/shlwapi/tests/path.c | 14 ++++++++++++++
  2 files changed, 16 insertions(+), 2 deletions(-)


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