Petr Štetiar 0a08a9a2b4 build: fix checks for GCC11
Fedora 34 already uses GCC11.

Reported-by: Marcin Juszkiewicz <marcin-openwrt@juszkiewicz.com.pl>
Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit cae69d558135456976b8fc6cb08530d1358cf6d5)
2021-03-06 15:48:03 +01:00
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