Fix broken build on windows
Fix broken build on windows

Less brittle path handling for URL construction

As discussed in comments on SHA:  f73385a more work may need to be done.

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