d3dx9: Implementation of D3DXGetShaderVersion

["Luis C. Busquets Pérez"]

This functions gets the Version Token of a binary shader. This Token is 
the first of the binary stream so it is as easy as picling the pointed 
DWORD. This is all public information available to the public.

Furthermore, it returns 0 if the value passed is null as pointed out by 
Yvan Gyurdiev.

I have tested the results with Civ4 (by making a derivation on d3dx9_32 
with this function and using the original d3dx9_36.D3DXGetShaderVersion 
function) and the results where the same for all the shaders that where 
present.



---
  dlls/d3dx9_36/Makefile.in   |    3 +-
  dlls/d3dx9_36/d3dx9_36.spec |    2 +-
  dlls/d3dx9_36/shader.c      |   46 
+++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 49 insertions(+), 2 deletions(-)
  create mode 100644 dlls/d3dx9_36/shader.c
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