Circular dependency due to backport from master

[Henrique de Moraes Holschuh]

Adrian,

There's this backport in openwrt-19.07 (snapshot):

commit 86aeac4fc98f42ac0ce7e0dcf1cb240e16b28f8f
Author:     Adrian Schmutzler <freifunk at adrianschmutzler.de>
AuthorDate: Fri Mar 13 16:56:53 2020 +0100
Commit:     Adrian Schmutzler <freifunk at adrianschmutzler.de>
CommitDate: Wed Feb 24 18:05:02 2021 +0100
base-files: source functions.sh in /lib/functions/system.sh
The file /lib/functions/system.sh depends on find_mtd_index() and
find_mtd_part() located in /lib/function.sh, so let's source that
file.
Signed-off-by: Adrian Schmutzler <freifunk at adrianschmutzler.de>
(backported from commit ae636effd24a7637cefca58a143063f395c82d05)


However, in openwrt-19.07, /lib/functions.sh *still* has one instance of 
"source lib/functions/system.sh", because commit 
282e8173509a0907ec469d493f3bd9fed710c453 (base-files: do not source 
system.sh in functions.sh) was not backported.

Maybe commit 282e8173509a0907ec469d493f3bd9fed710c453 also needs to be 
backported (likely with an added Fixes: 
86aeac4fc98f42ac0ce7e0dcf1cb240e16b28f8f pseudo-header) ?

-- 
Henrique de Moraes Holschuh
Analista de Projetos
Centro de Estudos e Pesquisas em Tecnologias de Redes e Operações 
(Ceptro.br)
+55 11 5509-3537 R.:4023
INOC 22548*625
www.nic.br