[dmd-internals] type inconsistency in the source code

[mrmocool at gmx.de]

> Well, it's a matter of taste really, I like the _t, I don't see how is
> a bad practice (in C at least makes a lot of sense). Also, even being
> a D compiler, is written in C/C++ and you already have those types
> there, I thought part of your improvements were to remove artificial
> typedef with strange names.
>
> Anyway, I don't care that much...

Yeah, I know maybe practice isn't the right word.
Anyway, primarily I'd like to have consistent types (+ no senseless  
typedefs, yes).

Secondarily I'd love to have types that at least look like they were  
builtin. But it's okay if that isn't desired.