Added detection for case-sensitive file systems
Added detection for case-sensitive file systems

This is needed for the moment because of a bug in virtualenv (reported upstream).

cbrewster/servo,KiChjang/servo,SimonSapin/servo,anthgur/servo,CJ8664/servo,saneyuki/servo,dsandeephegde/servo,paulrouget/servo,larsbergstrom/servo,pyfisch/servo,canaltinova/servo,CJ8664/servo,DominoTree/servo,mattnenterprise/servo,nrc/servo,fiji-flo/servo,splav/servo,upsuper/servo,nnethercote/servo,upsuper/servo,emilio/servo,nrc/servo,peterjoel/servo,thiagopnts/servo,ConnorGBrewster/servo,ConnorGBrewster/servo,nnethercote/servo,eddyb/servo,KiChjang/servo,dati91/servo,DominoTree/servo,szeged/servo,ConnorGBrewster/servo,larsbergstrom/servo,dati91/servo,saneyuki/servo,ConnorGBrewster/servo,mattnenterprise/servo,peterjoel/servo,mbrubeck/servo,DominoTree/servo,SimonSapin/servo,szeged/servo,emilio/servo,notriddle/servo,eddyb/servo,notriddle/servo,dati91/servo,upsuper/servo,dati91/servo,pyfisch/servo,pyfisch/servo,mattnenterprise/servo,KiChjang/servo,fiji-flo/servo,mbrubeck/servo,splav/servo,rnestler/servo,canaltinova/servo,rnestler/servo,KiChjang/servo,eddyb/servo,saneyuki/servo,upsuper/servo,mbrubeck/servo,ConnorGBrewster/servo,dati91/servo,mbrubeck/servo,rnestler/servo,szeged/servo,thiagopnts/servo,canaltinova/servo,szeged/servo,nnethercote/servo,szeged/servo,nnethercote/servo,mattnenterprise/servo,avadacatavra/servo,jimberlage/servo,thiagopnts/servo,SimonSapin/servo,canaltinova/servo,ConnorGBrewster/servo,avadacatavra/servo,jimberlage/servo,rnestler/servo,anthgur/servo,canaltinova/servo,notriddle/servo,thiagopnts/servo,cbrewster/servo,DominoTree/servo,rnestler/servo,fiji-flo/servo,notriddle/servo,SimonSapin/servo,notriddle/servo,notriddle/servo,splav/servo,canaltinova/servo,splav/servo,canaltinova/servo,saneyuki/servo,fiji-flo/servo,KiChjang/servo,mbrubeck/servo,jimberlage/servo,dsandeephegde/servo,emilio/servo,nnethercote/servo,splav/servo,anthgur/servo,sadmansk/servo,upsuper/servo,eddyb/servo,sadmansk/servo,eddyb/servo,nrc/servo,pyfisch/servo,eddyb/servo,paulrouget/servo,CJ8664/servo,peterjoel/servo,SimonSapin/servo,emilio/servo,thiagopnts/servo,dsandeephegde/servo,cbrewster/servo,emilio/servo,avadacatavra/servo,sadmansk/servo,fiji-flo/servo,peterjoel/servo,upsuper/servo,paulrouget/servo,emilio/servo,jimberlage/servo,szeged/servo,canaltinova/servo,DominoTree/servo,pyfisch/servo,mattnenterprise/servo,pyfisch/servo,rnestler/servo,dati91/servo,sadmansk/servo,splav/servo,CJ8664/servo,avadacatavra/servo,paulrouget/servo,dsandeephegde/servo,larsbergstrom/servo,CJ8664/servo,larsbergstrom/servo,splav/servo,mbrubeck/servo,nnethercote/servo,larsbergstrom/servo,larsbergstrom/servo,sadmansk/servo,thiagopnts/servo,notriddle/servo,nrc/servo,paulrouget/servo,paulrouget/servo,anthgur/servo,thiagopnts/servo,fiji-flo/servo,nrc/servo,cbrewster/servo,paulrouget/servo,notriddle/servo,nrc/servo,cbrewster/servo,dati91/servo,dsandeephegde/servo,SimonSapin/servo,nnethercote/servo,ConnorGBrewster/servo,mbrubeck/servo,saneyuki/servo,jimberlage/servo,splav/servo,fiji-flo/servo,eddyb/servo,DominoTree/servo,pyfisch/servo,paulrouget/servo,larsbergstrom/servo,jimberlage/servo,sadmansk/servo,DominoTree/servo,szeged/servo,pyfisch/servo,szeged/servo,emilio/servo,pyfisch/servo,emilio/servo,dsandeephegde/servo,avadacatavra/servo,KiChjang/servo,SimonSapin/servo,larsbergstrom/servo,saneyuki/servo,avadacatavra/servo,paulrouget/servo,sadmansk/servo,nrc/servo,splav/servo,cbrewster/servo,anthgur/servo,peterjoel/servo,peterjoel/servo,saneyuki/servo,saneyuki/servo,emilio/servo,anthgur/servo,eddyb/servo,CJ8664/servo,sadmansk/servo,mbrubeck/servo,peterjoel/servo,thiagopnts/servo,dati91/servo,jimberlage/servo,DominoTree/servo,SimonSapin/servo,KiChjang/servo,avadacatavra/servo,szeged/servo,cbrewster/servo,CJ8664/servo,larsbergstrom/servo,KiChjang/servo,ConnorGBrewster/servo,KiChjang/servo,upsuper/servo,jimberlage/servo,nnethercote/servo,notriddle/servo,cbrewster/servo,mattnenterprise/servo,DominoTree/servo,CJ8664/servo,nnethercote/servo,dsandeephegde/servo,szeged/servo,mattnenterprise/servo,saneyuki/servo,emilio/servo,KiChjang/servo,larsbergstrom/servo,rnestler/servo,anthgur/servo,splav/servo,pyfisch/servo,notriddle/servo,peterjoel/servo,rnestler/servo,anthgur/servo,peterjoel/servo,jimberlage/servo,paulrouget/servo,dsandeephegde/servo,DominoTree/servo,upsuper/servo,fiji-flo/servo,mattnenterprise/servo,nnethercote/servo,avadacatavra/servo,peterjoel/servo,saneyuki/servo