[D1] -v2: Don't warn about extern(C) ref static array parameters

Complement to b5595f936d2440d9e5d0dbf1fd02e1d9a20bfdda
Merge pull request #4137 from mihails-strasuns-sociomantic/compatible-extern-static-arr

[D1] -v2: Don't warn about extern(C) ref static array parameters