Don't log errors when V6ONLY fails.
Don't log errors when V6ONLY fails.

This is reportedly needed for OpenBSD.

darcs-hash:20060521053910-4cc09-407d77aa5ac5cdd3eb20668946910d902e78ecb1.gz

nxtreaming/chumen,fqtools/polipo,jech/polipo,gorakhargosh/polipo,jeromelebel/polipo,berkley4/polipo,berkley4/polipo,nxtreaming/chumen,TierraDelFuego/opilop,akkakks/polipo,akkakks/polipo,toke/polipo,Android-Apps/polipo,Android-Apps/polipo,dxq-git/polipo,lkraider/polipo,feijilei/polipo,caeies/polipo-caeies,ssb22/polipo2,fqtools/polipo,dxq-git/polipo,fqtools/polipo,ssb22/polipo2,Psiphon-Inc/polipo,lkraider/polipo,feijilei/polipo,danchr/polipo,nxtreaming/chumen,feijilei/polipo,dxq-git/polipo,berkley4/polipo,lkraider/polipo,clowwindy/polipo,strongwillow/polipo,akkakks/polipo,ajmgh/polipo,jech/polipo,galeksandrp/polipo,jech/polipo,galeksandrp/polipo,ssb22/polipo2,galeksandrp/polipo,fukusaka/polipo,strongwillow/polipo,doublec/namecoin-polipo