[FS#981] arc770: build failure: xtables-addons fails to build LUA extension because of kernel #define

[LEDE Bugs]

The following task has a new comment added:

FS#981 - arc770: build failure: xtables-addons fails to build LUA extension because of kernel #define
User who did this - Baptiste Jonglez (bjonglez)

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This also affects the ''archs38'' target, which uses the same kernel.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=981#comment3345