Fix Phobos dependencies on autodecoding

[Walter Bright]

On 8/15/2019 3:56 PM, H. S. Teoh wrote:
> And now that you agree that character encoding should be based on
> "symbol" rather than "glyph", the next step is the realization that, in
> the wide world of international languages out there, there exist
> multiple "symbols" that are rendered with the *same* glyph.  This is a
> hard fact of reality, and no matter how you wish it to be otherwise, it
> simply ain't so.  Your ideal of "character == glyph" simply doesn't
> work in real life.

Splitting semantic hares is pointless, as the fact remains it worked just fine 
in real life before Unicode, it's called "printing" on paper.

As for not working in real life, that's Unicode.