The APEX boot loader embeds the time of the build in its version
banner, which makes the Iomega NAS100D factory image differ between
builds:
-compiled for OpenWrt NAS100D/BE on 2026.Sep.23-04:17:21
+compiled for OpenWrt NAS100D/BE on 2026.Sep.23-11:06:03
APEX sets BUILDDATE with $(shell date) in its top level Makefile. Pass
BUILDDATE on the command line, formatted from SOURCE_DATE_EPOCH in UTC
and the C locale, which overrides it for all sub-makes.
Link: https://github.com/openwrt/openwrt/pull/25354
Signed-off-by: Paul Spooren <mail@aparcar.org>