ole32: Make clipboard latest_snapshot access thread safe

[Piotr Caban]

Signed-off-by: Piotr Caban <piotr at codeweavers.com>
---
  dlls/ole32/clipboard.c       | 31 +++++++++++++++++++++++++------
  dlls/ole32/tests/clipboard.c | 33 +++++++++++++++++++++++++++++++++
  2 files changed, 58 insertions(+), 6 deletions(-)


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