[Issue 24769] Add pragma compile on import

[d-bugmail at puremagic.com]

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

--- Comment #5 from Richard (Rikki) Andrew Cattermole <alphaglosined at gmail.com> ---
The -i switch suffers the same duplicate issues as the pragma, you should not
have to be altering your compile command to remove this, nor tell the linker
how to handle duplicates.

Solving it for one, solves it for both.

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