Remove ip4_input() declaration. It was removed in r275133.

MFC after:	1 month
Init array field in the proper place.

Obtained from:	OpenBSD
ANSIfy b64_pton
Merge remote-tracking branch 'freebsd/master' into hardened/current/master
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/segvguard