Recognize `ZipArchive` as an extension class
Recognize `ZipArchive` as an extension class

Summary: See D7879 for an example. This is an extension class.

Test Plan: You do it bwahaha

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7880

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