[Issue 18958] extern(C++) wchar, dchar mangling not correct

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18958

--- Comment #2 from Manu <turkeyman at gmail.com> ---
Separate issue creates for wchar_t:
https://issues.dlang.org/show_bug.cgi?id=18997

PR for this issue here: https://github.com/dlang/dmd/pull/8342

Problem is unit-tests that link against DMC++ fail, because DMC doesn't support
utf16/32 char types.

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