D3D: Implement vertex blending in drawStridedSlow

[Claudio Ciccani]

The patch implements a software fallback for vertex blending in
drawStridedSlow, fixing Bug #6955.
Although vertex blending is an old and outdated extension, there are
still many applications(games) relying on it nowadays. This because the
extension is generally supported by Direct3D, either directly in
hardware (using vertex programs) or in software.


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