avoid two possible ways to create $G/VERSION and $G/SYSCONFDIR.imp

[rainers]

trying to fix the semophore CI failure.

There are currently two ways to generate the VERSION and SYSCONFDIR.imp files in the generated folder: via config.d or as a dependency in the build.d script. These might both get executed in arbitrary order and maybe generate different results,

[dlang-bot]

Thanks for your pull request, @rainers!

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Testing this PR locally

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dub fetch digger
dub run digger -- build "master + dmd#10242"

[rainers]

Looks promising, but this currently removes the unconditional updating of the hash in the version file.
This functionality should probably be added to build.d so it can replace config.d.

[rainers]

This functionality should probably be added to build.d so it can replace config.d.

copied updateIfChanged over to build.d but left config.d in place for now to not break dependent projects (it's referenced in dub.sdl).

[Geod24]

Thanks for taking care of this :)

[marler8997]

Nice work figuring this one out

[WalterBright]

Thank you, @rainers !