[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

kinke at gmx.net changed:

           What    |Removed                     |Added
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                 CC|                            |kinke at gmx.net

--- Comment #1 from kinke at gmx.net ---
It has to with `--build-mode=singleFile`. It means 'compile all D files into a
single object file', so it cannot reuse previous compilation results.

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