[Issue 20445] [tools] remove build date for a reproducible build

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20445
Issue 20445 depends on issue 20444, which changed state.

Issue 20444 Summary: Make __DATE__ in dlang reproducible using SOURCE_DATE_EPOCH
https://issues.dlang.org/show_bug.cgi?id=20444

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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