[Issue 17946] Dub recompiles all the files when only one was edited compiling --build-mode=singleFile

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17946

--- Comment #3 from kinke at gmx.net ---
(In reply to Temtaime from comment #2)
> No, it compiles all the files to many object files, so it can it.
> I already patched source to do such a behavior

Ah sorry my bad, I confused it with LDC's `-singleobj`.

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