Move to support 64-bit ruby on Windows.
Move to support 64-bit ruby on Windows.

Bump ohai and mixlib versions.  This will remove Ruby 1.9 support.

sh9189/omnibus,DataDog/omnibus-ruby,mattray/omnibus,strangelittlemonkey/omnibus,Scalr/omnibus,Scalr/omnibus,adamleff/omnibus,3ofcoins/chef-omnibus,3ofcoins/chef-omnibus,strangelittlemonkey/omnibus,Altiscale/omnibus,ashhher3/omnibus,higanworks/omnibus,rhass/omnibus,hugosato/omnibus,DataDog/omnibus-ruby,sh9189/omnibus,rapid7/omnibus,Scalr/omnibus,mattray/omnibus,szechyjs/omnibus,szechyjs/omnibus,rhass/omnibus,rhass/omnibus,chef/omnibus,DataDog/omnibus-ruby,chef/omnibus,higanworks/omnibus,pskrz/omnibus,intfrr/omnibus,intfrr/omnibus,mattray/omnibus,ashhher3/omnibus,chef/omnibus,strangelittlemonkey/omnibus,rapid7/omnibus,ashhher3/omnibus,intfrr/omnibus,Altiscale/omnibus,hugosato/omnibus,adamleff/omnibus,Altiscale/omnibus,pskrz/omnibus,adamleff/omnibus,hugosato/omnibus,sh9189/omnibus,jamesn/omnibus,higanworks/omnibus,3ofcoins/chef-omnibus,jamesn/omnibus,pskrz/omnibus,rapid7/omnibus,szechyjs/omnibus,jamesn/omnibus