winex11.drv: cache keyboard modifier states and only update state if they changed

[Aric Stewart]

This allows a program to programatically (such as with SendInput) change 
a modifier key state and have it persists as it should, instead of being 
lost with the next KeymapNotify.
---
  dlls/winex11.drv/keyboard.c |   19 ++++++++++++++++++-
  1 files changed, 18 insertions(+), 1 deletions(-)


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