ole32: OLE clipboard functions should fail if OLE hasn't been initialised.

[Robert Shearman]

Add a field to the TLS data to determine whether OLE has been 
initialised for the current thread and use it in the OLE clipboard 
functions.

Fix the OLE clipboard test to call OleInitialize before performing the 
tests to fix test failures on Windows.
---
  dlls/ole32/clipboard.c       |   26 ++++++++++++++++++++++++++
  dlls/ole32/compobj_private.h |    1 +
  dlls/ole32/ole2.c            |   17 ++++-------------
  dlls/ole32/tests/clipboard.c |   19 +++++++++++++++++--
  4 files changed, 48 insertions(+), 15 deletions(-)
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