[PATCH v5] Makefile: Add build time and compiler info string

[Andreas Schwab]

On Okt 18 2021, Bin Meng wrote:

> If this BUILD_DATE_EPOCH is not needed at all, I am not sure why do we
> still keep

BUILD_DATE_EPOCH is also non-standard.  The standard variable is
SOURCE_DATE_EPOCH.

Andreas.

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Andreas Schwab, schwab at linux-m68k.org
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