[Toybox] ifconfig: __caddr_t is not portable

[Isaac Dunham]

ifconfig uses __caddr_t in one location; this is not guaranteed to work everywhere. It does not compile OOB on musl, so I changed it to the portable equivalent, char *.  This compiles on musl, and should compile anywhere.

-- 
Isaac Dunham <idunham at lavabit.com>
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