firmware-utils: honor env SOURCE_DATE_EPOCH
authorAlexander Couzens <lynxis@fe80.eu>
Sun, 18 Jun 2017 00:21:21 +0000 (02:21 +0200)
committerAlexander Couzens <lynxis@fe80.eu>
Mon, 19 Jun 2017 12:34:52 +0000 (14:34 +0200)
Use the timestamp from the enviroment SOURCE_DATE_EPOCH
if set instead of the build time.
Fixes reproducible builds for certain firmware images.

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

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