d3dx8: Added D3DXGetErrorStringW stub

["Luis C. Busquets Pérez"]

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  dlls/d3dx8/d3dx8.spec   |    2 +-
  dlls/d3dx8/d3dx8_main.c |    5 +++++
  include/d3dx8core.h     |    2 +-
  3 files changed, 7 insertions(+), 2 deletions(-)
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