Remove "--mtime" option introduced in commit 18c9faa032 ("tools: zip:
add option for reproducible archives") and instead fetch SOURCE_DATE_EPOCH
environment variable directly in the code.
Ref: https://sourceforge.net/p/infozip/patches/25/
Signed-off-by: Sungbo Eo <mans0n@gorani.run>
(cherry picked from commit 39d06472eb)
51c26f0c97