Windows build failure - C2131: expression did not evaluate to a constant

[Stephan Bergmann]

On 04/12/2018 14:18, Kaganski Mike wrote:
> Reported that to
> https://developercommunity.visualstudio.com/content/problem/398218/c2131-error-with-stdarray-and-stdmake-integer-sequ.html.
> 
> As noted there, I have discovered the code to succeed if I replace 256
> to any number up to 234.

So lets revert that again until there is a newer Visual Studio 2017 that 
fixes that regression.  <https://gerrit.libreoffice.org/#/c/64618/> 
"Revert 'Compute (un-)premultiply_table at compile time'".