[Issue 15245] tools do not support --version flag properly

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15245

--- Comment #2 from Joseph Rushton Wakeling <joseph.wakeling at webdrake.net> ---
> It does not have a version because it has no releases - a release is effectively a push to GitHub.

... and yet the repo is tagged with dmd release numbers.

I'm not suggesting the tools _have_ to be tied to dmd release schedule, but
some kind of support of --version would make sense, even if it's just to report
the hash and date of the most recent commit.

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