[Buildroot] [PATCH] Makefile: fix use of many br2-external trees

[Yann E. MORIN]

All,

On 2022-09-17 09:34 +0200, Yann E. MORIN spake thusly:
[--SNIP--]
> To keep the promise that later defconfig files override previous ones
> (which we do doucment in our manual), we need to memorise what defconfig
         ,----'^^^
*document

[--SNIP--]
> -# Override the BR2_DEFCONFIG from COMMON_CONFIG_ENV with the new defconfig

I forgot to restore this comment before comitting. It contains an
important information, so must be kept.

Regards,
Yann E. MORIN.

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