[FS#1101] gcc 7.x causing luci bad gateway

[LEDE Bugs]

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FS#1101 - gcc 7.x causing luci bad gateway
User who did this: Yousong Zhou (yousong)
Summary: luci bad gateway -> gcc 7.x causing luci bad gateway

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1101