MAINT: interpolate: remove duplicated FITPACK interface `spalde`.
MAINT: interpolate: remove duplicated FITPACK interface `spalde`.

scipy/scipy,scipy/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,scipy/scipy,anntzer/scipy,scipy/scipy,anntzer/scipy,WarrenWeckesser/scipy,andyfaff/scipy,WarrenWeckesser/scipy,andyfaff/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,anntzer/scipy,WarrenWeckesser/scipy,andyfaff/scipy,scipy/scipy,anntzer/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,anntzer/scipy,andyfaff/scipy,scipy/scipy,WarrenWeckesser/scipy,andyfaff/scipy,WarrenWeckesser/scipy,andyfaff/scipy,Stefan-Endres/scipy,anntzer/scipy