[BusyBox] Today's ash improvements

[蔡恆華]

> to (is_digit(c)||c=='!'||c=='#'||c=='$'||c=='*'||c=='-').
How about:
strchr("!@$%#$0123456789", c) or
is_digit(c)||strchr("!@$%#$", c)

Regards,
I.Q.