Reduce package size by copying correct native dlls

[saskathex]

To reduce the final package size copy include the native dlls as following:

• "AnyCPU" copy both native dlls (x86, x64)
• "x64" copy only x64 native dll
• "x86" copy only x86 native dll

[HakanL]

Did you look at the generated nuget package? I would actually expect the output size to be the same, since it's built for both architectures.

[saskathex]

Yes you are correct, the package has the same size. What I more meant is when building the final release lets say x64, then the x64 runtime dll is only copied to the final build. So package size should have been called "final release build".

I closed the pull request, since it did not work the expected way.