Make shared static this() encoding table compilable

[Patrick Schluter]

On Thursday, 17 March 2022 at 12:11:19 UTC, Patrick Schluter 
wrote:
> On Thursday, 17 March 2022 at 11:36:40 UTC, Patrick Schluter 
> wrote:

>> [...]
> Something akin to
> ```d
> auto lookup(ushort key)
> {
>   return cp949[key-0x8141];
> }
>
> [...]

Takes 165 ms to compile with dmd 2.094.2 -O on [godbolt] with the 
whole table generated from the Unicode link.

[godbolt]: https://godbolt.org/z/hEzP7rKnn]