[Buildroot] Reduce clutter while feature testing

[Jens Stimpfle <debian@jstimpfle.de>]

Hi,

two little patches including notes are attached for
support/dependencies/dependencies.sh

Btw, is there any interest in having the shell scripts cleaned up, even
if this includes more intrusive changes? I'd like to get involved by
playing a little bit with static analysis.

Thanks for your work,
Jens Stimpfle
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