[Issue 24669] ImportC: C files are not compiled with '-i' flag

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24669

--- Comment #1 from dave287091 at gmail.com ---
https://issues.dlang.org/show_bug.cgi?id=24668 might block this as projects
that currently work importing *.c files for decls only might stop working.

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