[FS#1072] AR71xx / TP-RE450: Can't build image with kernel 4.9.x

[LEDE Bugs]

The following task has a new comment added:

FS#1072 - AR71xx / TP-RE450: Can't build image with kernel 4.9.x
User who did this - FreifunkUFO (FreifunkUFO)

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see also https://bugs.lede-project.org/index.php?do=details&task_id=1109
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1072#comment3704