wined3d: Use a separate mutex for wndproc_table access.

[Piotr Pawlow]

If CreateDevice is called with hFocusWindow belonging to another thread,
then any code that does SendMessage (or equivalent) to the window while
holding the main wined3d mutex causes a deadlock, because wined3d_wndproc
tries to acquire the same mutex for wndproc_table access. Using a different
mutex for this purpose solves the problem.
---
  dlls/wined3d/wined3d_main.c |   44 
+++++++++++++++++++++++++++++++-----------
  1 files changed, 32 insertions(+), 12 deletions(-)


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