Solve exception locking in winex11.drv

[Aric Stewart]

Try to hack around issues where an exception when trying to read source 
data from a DIB causes 2 exceptions in winex11.drv to deadlock each 
other by raising the reading exception before entering the locks in 
winex11.drv
---
  dlls/gdi32/dib.c |    4 ++++
  1 files changed, 4 insertions(+), 0 deletions(-)
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