Fix physicalMemory on FreeBSD.
Fix physicalMemory on FreeBSD.

Due to Frank Behrens.

darcs-hash:20081024182336-4cc09-21d533f5a07e1fdae493fee48a596a17a8a08bc7.gz

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