Fix Cython 0.28 build break of qhull.pyx
Fix Cython 0.28 build break of qhull.pyx

Fixes https://github.com/cython/cython/issues/2154
while maintaining ability to use Cython 0.27.3 and earlier

pizzathief/scipy,ilayn/scipy,nmayorov/scipy,tylerjereddy/scipy,grlee77/scipy,tylerjereddy/scipy,aeklant/scipy,ilayn/scipy,mdhaber/scipy,perimosocordiae/scipy,scipy/scipy,lhilt/scipy,rgommers/scipy,andyfaff/scipy,anntzer/scipy,lhilt/scipy,rgommers/scipy,tylerjereddy/scipy,zerothi/scipy,arokem/scipy,WarrenWeckesser/scipy,vigna/scipy,jamestwebber/scipy,rgommers/scipy,jamestwebber/scipy,Eric89GXL/scipy,Eric89GXL/scipy,person142/scipy,zerothi/scipy,gertingold/scipy,mdhaber/scipy,grlee77/scipy,endolith/scipy,aeklant/scipy,vigna/scipy,anntzer/scipy,WarrenWeckesser/scipy,gfyoung/scipy,arokem/scipy,Stefan-Endres/scipy,arokem/scipy,andyfaff/scipy,perimosocordiae/scipy,grlee77/scipy,perimosocordiae/scipy,person142/scipy,grlee77/scipy,andyfaff/scipy,scipy/scipy,anntzer/scipy,aeklant/scipy,person142/scipy,endolith/scipy,andyfaff/scipy,aarchiba/scipy,e-q/scipy,zerothi/scipy,andyfaff/scipy,ilayn/scipy,mdhaber/scipy,grlee77/scipy,pizzathief/scipy,aeklant/scipy,jor-/scipy,nmayorov/scipy,Eric89GXL/scipy,anntzer/scipy,lhilt/scipy,nmayorov/scipy,ilayn/scipy,mdhaber/scipy,gertingold/scipy,Stefan-Endres/scipy,person142/scipy,nmayorov/scipy,ilayn/scipy,matthew-brett/scipy,endolith/scipy,jamestwebber/scipy,rgommers/scipy,tylerjereddy/scipy,matthew-brett/scipy,lhilt/scipy,pizzathief/scipy,e-q/scipy,aeklant/scipy,scipy/scipy,gfyoung/scipy,Stefan-Endres/scipy,person142/scipy,Stefan-Endres/scipy,nmayorov/scipy,e-q/scipy,aarchiba/scipy,jamestwebber/scipy,gertingold/scipy,jamestwebber/scipy,Eric89GXL/scipy,tylerjereddy/scipy,WarrenWeckesser/scipy,lhilt/scipy,ilayn/scipy,perimosocordiae/scipy,jor-/scipy,gertingold/scipy,WarrenWeckesser/scipy,pizzathief/scipy,Stefan-Endres/scipy,aarchiba/scipy,rgommers/scipy,scipy/scipy,scipy/scipy,pizzathief/scipy,zerothi/scipy,gertingold/scipy,gfyoung/scipy,aarchiba/scipy,scipy/scipy,anntzer/scipy,vigna/scipy,Eric89GXL/scipy,arokem/scipy,e-q/scipy,gfyoung/scipy,endolith/scipy,vigna/scipy,jor-/scipy,matthew-brett/scipy,jor-/scipy,arokem/scipy,vigna/scipy,anntzer/scipy,zerothi/scipy,WarrenWeckesser/scipy,endolith/scipy,mdhaber/scipy,andyfaff/scipy,matthew-brett/scipy,gfyoung/scipy,zerothi/scipy,matthew-brett/scipy,aarchiba/scipy,jor-/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,endolith/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,e-q/scipy,Eric89GXL/scipy,mdhaber/scipy