build: fix checks for GCC11
authorPetr Štetiar <ynezz@true.cz>
Mon, 1 Mar 2021 12:29:19 +0000 (13:29 +0100)
committerPetr Štetiar <ynezz@true.cz>
Wed, 3 Mar 2021 21:51:39 +0000 (22:51 +0100)
Fedora 34 already uses GCC11.

Reported-by: Marcin Juszkiewicz <marcin-openwrt@juszkiewicz.com.pl>
Signed-off-by: Petr Štetiar <ynezz@true.cz>

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