Check if WINED3DRS_VERTEXBLEND is dirty in transform_world

[Lisa Denia]

This fixes the flickering cursor mentioned in Bug 
#14375(http://bugs.winehq.org/show_bug.cgi?id=14375).
The cursor flickers because the scene gets rendered twice a draw, which is 
known and expected. The cursor is not one of that usual animated 2d things, 
but a 3d object. So, in every draw, the scene gets rendered, the cursor gets 
rendered, and the scene gets rendered again. The attached patch checks for 
that special case.

---
 dlls/wined3d/state.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)


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