Felix Fietkau e43beeac93 build: process variable exports from toplevel.mk only once
These run a lot of expensive shell calls, so redundant calls should be
avoided

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: maurerr <mariusd84@gmail.com>
2021-09-01 08:07:05 +00:00
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