[Issue 19260] extern(C++) `T* const` mangling

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19260

--- Comment #3 from kinke at gmx.net ---
I don't think there's a need for a proper solution for this on the D side:

1) `T* const` is rare in my experience.
2) This `const` affecting the C++ mangle is a big mistake IMO. The caller can't
care less about it, it's just an implementation detail of the callee (not gonna
mutate the param, i.e., my private pointer copy) leaking to the outside world
and causing issues like this.

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