Fix `DirectoryUnpackStrategy` following symlinks.
Fix `DirectoryUnpackStrategy` following symlinks.

reitermarkus/brew,MikeMcQuaid/brew,EricFromCanada/brew,reitermarkus/brew,JCount/brew,vitorgalvao/brew,vitorgalvao/brew,DomT4/brew,reitermarkus/brew,Homebrew/brew,sjackman/homebrew,DomT4/brew,DomT4/brew,EricFromCanada/brew,maxim-belkin/brew,Homebrew/brew,sjackman/homebrew,vitorgalvao/brew,konqui/brew,maxim-belkin/brew,sjackman/homebrew,JCount/brew,mahori/brew,konqui/brew,mahori/brew,reitermarkus/brew,MikeMcQuaid/brew,mahori/brew,Linuxbrew/brew,Linuxbrew/brew,JCount/brew,claui/brew,Linuxbrew/brew,claui/brew,nandub/brew,mahori/brew,MikeMcQuaid/brew,Linuxbrew/brew,vitorgalvao/brew,JCount/brew,DomT4/brew,MikeMcQuaid/brew,maxim-belkin/brew,EricFromCanada/brew,nandub/brew,Homebrew/brew,Homebrew/brew,EricFromCanada/brew,claui/brew,konqui/brew,claui/brew,konqui/brew,sjackman/homebrew,nandub/brew,nandub/brew