winex11drv: Distinguish left and right keys for shift, ctrl and alt. (try-3)

[Vitaliy Margolen]

Keep WM_KEY[UP|DOWN] messages the same as before - they don't report 
separate left/right keys.

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  dlls/winex11.drv/keyboard.c |   28 ++++++++++++++++++++--------
  1 files changed, 20 insertions(+), 8 deletions(-)
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