skip symlink tests when `not hasattr(os, 'symlink')`
skip symlink tests when `not hasattr(os, 'symlink')`

KarelJakubec/pip,benesch/pip,blarghmatey/pip,harrisonfeng/pip,Gabriel439/pip,ChristopherHogan/pip,h4ck3rm1k3/pip,blarghmatey/pip,KarelJakubec/pip,jamezpolley/pip,mattrobenolt/pip,natefoo/pip,haridsv/pip,pjdelport/pip,luzfcb/pip,Ivoz/pip,natefoo/pip,habnabit/pip,caosmo/pip,willingc/pip,haridsv/pip,techtonik/pip,benesch/pip,luzfcb/pip,supriyantomaftuh/pip,tdsmith/pip,RonnyPfannschmidt/pip,caosmo/pip,dstufft/pip,rbtcollins/pip,jythontools/pip,tdsmith/pip,jmagnusson/pip,h4ck3rm1k3/pip,minrk/pip,dstufft/pip,atdaemon/pip,mujiansu/pip,pjdelport/pip,pradyunsg/pip,ncoghlan/pip,willingc/pip,atdaemon/pip,caosmo/pip,pfmoore/pip,mujiansu/pip,zorosteven/pip,prasaianooz/pip,jmagnusson/pip,jasonkying/pip,sigmavirus24/pip,zvezdan/pip,fiber-space/pip,cjerdonek/pip,sigmavirus24/pip,wkeyword/pip,qbdsoft/pip,erikrose/pip,James-Firth/pip,zorosteven/pip,zenlambda/pip,rbtcollins/pip,davidovich/pip,jythontools/pip,harrisonfeng/pip,RonnyPfannschmidt/pip,yati-sagade/pip,h4ck3rm1k3/pip,pradyunsg/pip,blarghmatey/pip,harrisonfeng/pip,ianw/pip,zenlambda/pip,chaoallsome/pip,prasaianooz/pip,patricklaw/pip,graingert/pip,davidovich/pip,pypa/pip,techtonik/pip,xavfernandez/pip,pfmoore/pip,fiber-space/pip,rouge8/pip,natefoo/pip,pjdelport/pip,ianw/pip,rouge8/pip,atdaemon/pip,jamezpolley/pip,erikrose/pip,minrk/pip,jasonkying/pip,erikrose/pip,RonnyPfannschmidt/pip,habnabit/pip,nthall/pip,ncoghlan/pip,supriyantomaftuh/pip,sbidoul/pip,alex/pip,chaoallsome/pip,jmagnusson/pip,squidsoup/pip,rouge8/pip,nthall/pip,jasonkying/pip,mattrobenolt/pip,fiber-space/pip,xavfernandez/pip,Ivoz/pip,mujiansu/pip,sbidoul/pip,wkeyword/pip,ChristopherHogan/pip,James-Firth/pip,Gabriel439/pip,pypa/pip,nthall/pip,willingc/pip,xavfernandez/pip,yati-sagade/pip,Carreau/pip,rbtcollins/pip,KarelJakubec/pip,jythontools/pip,mindw/pip,alex/pip,qbdsoft/pip,esc/pip,graingert/pip,mindw/pip,esc/pip,squidsoup/pip,supriyantomaftuh/pip,benesch/pip,habnabit/pip,graingert/pip,msabramo/pip,luzfcb/pip,davidovich/pip,zenlambda/pip,squidsoup/pip,chaoallsome/pip,zorosteven/pip,Carreau/pip,ncoghlan/pip,James-Firth/pip,esc/pip,prasaianooz/pip,zvezdan/pip,tdsmith/pip,sigmavirus24/pip,alex/pip,zvezdan/pip,dstufft/pip,qbdsoft/pip,patricklaw/pip,cjerdonek/pip,techtonik/pip,jamezpolley/pip,haridsv/pip,msabramo/pip,mindw/pip,Gabriel439/pip,wkeyword/pip,yati-sagade/pip,ChristopherHogan/pip