[1/2] Add stub dll d3dcompiler_46

[Alistair Leslie-Hughes]

Hi Matteo,

 > These two patches look fine to me except for the LPJUNK + hungarian
 > notation in DllMain().
This was just a copy of one of the other d3dcompile*.dll.

 > BTW where did you find that version number for d3dcompiler_46? Windows
 > 8 SDK? Just curious, I found two different version of
 > d3dcompiler_46.dll bundled with various stuff which have different
 > version numbers (even between them).

I based the version number from the dlls found in the SDK's that are 
installed with VS2012 and VS2013.

Best Regards
  Alistair Leslie-Hughes