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8dcc144b9e
Increase the range of characters that get substituted by '_' so the
shell doesn't complain about illegal variable names.
Primarily done to catch '.' and '-' but who knows what funnies will
appear in i/f names.
It's a shame that busybox ash doesn't understand :alnum:
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
(cherry picked from commit c8640d1f68)