[Issue 23143] ImportC: forward enum declarations need to be supported

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23143

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
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           Hardware|x86                         |All
                 OS|Windows                     |All
           Severity|normal                      |enhancement

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