[Issue 21963] importC: Support declaring union types

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21963

Dlang Bot <dlang-bot at dlang.rocks> changed:

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--- Comment #1 from Dlang Bot <dlang-bot at dlang.rocks> ---
@ibuclaw created dlang/dmd pull request #12575 "fix Issue 21963 - importC:
Support declaring union types" fixing this issue:

- fix Issue 21963 - importC: Support declaring union types

https://github.com/dlang/dmd/pull/12575

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