[PATCH 4/5] user32: Use a single lock in destroy_thread_windows.

[Jacek Caban]

Signed-off-by: Jacek Caban 
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This is a preparation for the next patch, which makes sure that there is 
no inconsistency between server and user32 view of window handles after 
destroy_thread_windows is done in user32, but not yet in server. This is 
probably not a big deal right now (although it's not right either), my 
main motivation is a rework of handles that I'm working on. If this and 
the next patch are not convincing alone, please hold them. I plan to 
share more patches for a better context soon, but I don't have them 
cleaned up enough yet.

dlls/user32/win.c | 40 +++++++++++++++++++++-------------------
  1 file changed, 21 insertions(+), 19 deletions(-)