https://bugs.winehq.org/show_bug.cgi?id=41167
--- Comment #7 from Jason Wood sandain@hotmail.com --- (In reply to Matteo Bruni from comment #6)
Nothing was changed in Wine which would fix this. Either the game now includes (and uses) native d3dcompiler_xx.dll or it stopped requiring that functionality altogether.
It is impossible to go back and test the same version of the game that I was running when I submitted this bug report. It is possible that the game no longer uses whatever function it was using before that broke the HLSL compiler. However, your first guess might just be spot on -- the game now seems to include a copy of d3dcompiler_47.dll for both 32- and 64-bit clients (but it is hard to say if it included anything before).