[Issue 23401] ImportC: add -cpp=filename switch to select C preprocessor

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23401

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|importc can't select        |ImportC: add -cpp=filename
                   |preprocessor                |switch to select C
                   |                            |preprocessor

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