Patrick Georgi 2f5d4a485e build system: allow overriding the build's timestamp
This allows reproducible builds (same source and same compiler produce
bit-identical results) and also allows coordinating the timestamp across
multiple projects, eg. with another firmware.

Signed-off-by: Patrick Georgi <pgeorgi@google.com>
2016-02-06 23:30:31 +01:00
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