remove :sigar "platform"
remove :sigar "platform"

i don't think this platform makes any sense, suspect we need to
remove it everywhere

acaiafa/ohai,cmluciano/ohai,Juniper/ohai,criteo-forks/ohai,jaymzh/ohai,tas50/ohai-1,jseely/ohai,adamleff/ohai,shtzr840329/ohai,sh9189/ohai,375gnu/ohai,jbfavre/ohai,Juniper/ohai,davide125/ohai,n-marton/ohai,nathwill/ohai,johnbellone/ohai,zshuo/ohai,juliandunn/ohai,numericillustration/ohai,http-418/ohai,sh9189/ohai,higanworks/ohai,bougyman/ohai,numericillustration/ohai,zshuo/ohai,shtzr840329/ohai,mattray/ohai,johnbellone/ohai,juliandunn/ohai,jseely/ohai,Fodoj/ohai,btm/ohai,glennmatthews/ohai,acaiafa/ohai,dreamnite/ohai,phreakocious/ohai,higanworks/ohai,nathwill/ohai,criteo-forks/ohai,cmluciano/ohai,glennmatthews/ohai,adamleff/ohai,dreamnite/ohai,Fodoj/ohai,mattray/ohai,btm/ohai,MSOpenTech/ohai,n-marton/ohai,phreakocious/ohai,http-418/ohai,chef/ohai,davide125/ohai,375gnu/ohai,tas50/ohai-1,jbfavre/ohai,bougyman/ohai,chef/ohai,jaymzh/ohai,MSOpenTech/ohai