Felix Fietkau 7716a43092 build: fix extreme build system slowdown caused by SOURCE_DATE_EPOCH changes
Adding inline shell invocations in per-target variables causes them to be
executed over and over again, which causes a significant slowdown.
Fix this by evaluating it only once per package directory

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2020-09-05 11:26:57 +02:00
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