Move Arcanist machine config location on Windows
Move Arcanist machine config location on Windows

Test Plan:
  $ set # on Windows

Reviewers: epriestley, dschleimer

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5733

memsql/arcanist,phacility/arcanist,calblueprint/arcanist,aik099/arcanist,wharris/arcanist,kevinseelbach/arcanist,chundongwang/arcanist,eSpark/arcanist,KieranHayes/arcanist,wxstars/arcanist,uber/arcanist,alexmv/arcanist,wikimedia/phabricator-arcanist,julkiewicz/arcanist,wikimedia/phabricator-arcanist,haskell-infra/arcanist,wikimedia/phabricator-arcanist,uber/arcanist,uber/arcanist,wxstars/arcanist,eSpark/arcanist,codelabs-ch/arcanist,r4nt/arcanist,hach-que/arcanist,jra3/arcanist,Symplicity/arcanist,PageUpPeopleOrg/arcanist-patches,fivestars/arcanist,fivestars/arcanist,hach-que/arcanist,aik099/arcanist,wxstars/arcanist,coursera/arcanist,haskell-infra/arcanist,calblueprint/arcanist,alexmv/arcanist,Khan/arcanist,folsom-labs/arcanist,hach-que/arcanist,wharris/arcanist,KieranHayes/arcanist,julkiewicz/arcanist,folsom-labs/arcanist,chundongwang/arcanist,Khan/arcanist,memsql/arcanist,eSpark/arcanist,zhihu/arcanist,Symplicity/arcanist,calblueprint/arcanist,fivestars/arcanist,aik099/arcanist,phacility/arcanist,kevinseelbach/arcanist,sneakpeeq/arcanist,dguo-coursera/arcanist,phacility/arcanist,dguo-coursera/arcanist,KieranHayes/arcanist,wharris/arcanist,PageUpPeopleOrg/arcanist-patches,coursera/arcanist,Khan/arcanist,zhihu/arcanist,zhihu/arcanist,kevinseelbach/arcanist,dguo-coursera/arcanist,r4nt/arcanist,haskell-infra/arcanist,wharris/arcanist,memsql/arcanist,chundongwang/arcanist,codelabs-ch/arcanist,PageUpPeopleOrg/arcanist-patches,PageUpPeopleOrg/arcanist-patches,wxstars/arcanist,sneakpeeq/arcanist,fivestars/arcanist,aik099/arcanist,alexmv/arcanist,phacility/arcanist,julkiewicz/arcanist,jra3/arcanist,codelabs-ch/arcanist,codelabs-ch/arcanist,folsom-labs/arcanist,jra3/arcanist,sneakpeeq/arcanist,haskell-infra/arcanist,eSpark/arcanist,memsql/arcanist,codelabs-ch/arcanist,jra3/arcanist,chundongwang/arcanist,alexmv/arcanist,kevinseelbach/arcanist,r4nt/arcanist,sneakpeeq/arcanist,Symplicity/arcanist,folsom-labs/arcanist,coursera/arcanist,Symplicity/arcanist,uber/arcanist,phacility/arcanist,hach-que/arcanist,r4nt/arcanist,coursera/arcanist,calblueprint/arcanist,wikimedia/phabricator-arcanist,Khan/arcanist,zhihu/arcanist,julkiewicz/arcanist,KieranHayes/arcanist,dguo-coursera/arcanist