[D1] Ignore ref storage class for extern(C) static array parameters

Results in syntax that is compatible between D1 and D2 and can be used
to preserve same semantics in type safe way. Right now only alternative
is to use plain pointer parameters which is big loss in type safety.
Merge pull request #4129 from mihails-strasuns-sociomantic/compatible-extern-static-arr

[D1] Ignore ref storage class for extern(C) static array parameters