Normalize path case in strip_sys_prefix.
Normalize path case in strip_sys_prefix.

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