[FS#1296] ar71xx doesnt build with gcc7

[LEDE Bugs]

The following task has a new comment added:

FS#1296 - ar71xx doesnt build with gcc7
User who did this - Sven Schönhoff (IronicSven)

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When I flash an image which was built with gcc7 on my Archer C7v4 ssh stops working and luci says "bad gateway". Do you have an similar error?
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1296#comment4246