[Issue 23812] ImportC: allow adding function attributes to imported C functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23812

johanengelen at weka.io changed:

           What    |Removed                     |Added
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           Keywords|                            |industry
                 CC|                            |johanengelen at weka.io

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