[Issue 24769] Add pragma compile on import

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24769

--- Comment #4 from Richard (Rikki) Andrew Cattermole <alphaglosined at gmail.com> ---
With dmd everything is weak, and will handle duplicates by-default.

It is ldc and gdc which I have concerns with for duplicates.

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