TST: interpolate: add fitpack test that passes only for ilp64
TST: interpolate: add fitpack test that passes only for ilp64

mdhaber/scipy,grlee77/scipy,grlee77/scipy,Eric89GXL/scipy,zerothi/scipy,perimosocordiae/scipy,pizzathief/scipy,tylerjereddy/scipy,anntzer/scipy,WarrenWeckesser/scipy,Eric89GXL/scipy,vigna/scipy,andyfaff/scipy,vigna/scipy,matthew-brett/scipy,nmayorov/scipy,perimosocordiae/scipy,perimosocordiae/scipy,endolith/scipy,vigna/scipy,anntzer/scipy,rgommers/scipy,mdhaber/scipy,ilayn/scipy,Eric89GXL/scipy,vigna/scipy,pizzathief/scipy,perimosocordiae/scipy,zerothi/scipy,ilayn/scipy,endolith/scipy,anntzer/scipy,zerothi/scipy,nmayorov/scipy,WarrenWeckesser/scipy,Eric89GXL/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,ilayn/scipy,ilayn/scipy,e-q/scipy,mdhaber/scipy,scipy/scipy,WarrenWeckesser/scipy,zerothi/scipy,grlee77/scipy,tylerjereddy/scipy,scipy/scipy,matthew-brett/scipy,ilayn/scipy,scipy/scipy,scipy/scipy,e-q/scipy,matthew-brett/scipy,anntzer/scipy,scipy/scipy,endolith/scipy,endolith/scipy,ilayn/scipy,andyfaff/scipy,scipy/scipy,tylerjereddy/scipy,rgommers/scipy,rgommers/scipy,tylerjereddy/scipy,andyfaff/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,zerothi/scipy,e-q/scipy,e-q/scipy,pizzathief/scipy,endolith/scipy,zerothi/scipy,endolith/scipy,WarrenWeckesser/scipy,rgommers/scipy,Stefan-Endres/scipy,vigna/scipy,matthew-brett/scipy,WarrenWeckesser/scipy,pizzathief/scipy,rgommers/scipy,perimosocordiae/scipy,mdhaber/scipy,e-q/scipy,nmayorov/scipy,pizzathief/scipy,andyfaff/scipy,nmayorov/scipy,Eric89GXL/scipy,grlee77/scipy,nmayorov/scipy,matthew-brett/scipy,WarrenWeckesser/scipy,grlee77/scipy,Stefan-Endres/scipy,andyfaff/scipy,anntzer/scipy,tylerjereddy/scipy,mdhaber/scipy,Eric89GXL/scipy,andyfaff/scipy,mdhaber/scipy,anntzer/scipy