D-dll support: testers needed round 2

[Martin Nowak]

On Saturday, 10 February 2018 at 02:24:58 UTC, rikki cattermole 
wrote:
> -import switch makes me a little concerned, what exactly is it 
> changing that makes it required?

I remember that we figured out that the MS Linker can optimize 
away the indirection when linking statically, so the paragraph 
seems a bit alarming 
https://github.com/Ingrater/DIPs/blob/ReviveDIP45/DIPs/DIP45.md#-useshared-compiler-flag.