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Certain combinations of wireless drivers (e.g., ath10k, mt7615) and
wireless modes (e.g., adhoc, 80211s) end up with the radio interfaces
not being risen up and not appearing in /sys/class/net/. Therefore, they
are never detected as wireless interfaces and, upon reconfiguration,
they are treated as wired ones, leading to wrong settings in
/etc/config/network. To avoid this behaviour, wireless interfaces are
now tested for *not* being "non-wireless.

Fixes #473
Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>