MAINT: special: remove unused specfun f2py wrappers
MAINT: special: remove unused specfun f2py wrappers

Various signatures in `specfun.pyf` are currently unused (likely
because many of them are now wrapped manually so that they can be
ufunc kernels); delete them.

e-q/scipy,pizzathief/scipy,tylerjereddy/scipy,andyfaff/scipy,mdhaber/scipy,vigna/scipy,person142/scipy,e-q/scipy,person142/scipy,anntzer/scipy,person142/scipy,grlee77/scipy,perimosocordiae/scipy,matthew-brett/scipy,ilayn/scipy,perimosocordiae/scipy,endolith/scipy,anntzer/scipy,zerothi/scipy,mdhaber/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,person142/scipy,mdhaber/scipy,rgommers/scipy,nmayorov/scipy,ilayn/scipy,ilayn/scipy,vigna/scipy,WarrenWeckesser/scipy,grlee77/scipy,zerothi/scipy,anntzer/scipy,person142/scipy,grlee77/scipy,matthew-brett/scipy,WarrenWeckesser/scipy,grlee77/scipy,WarrenWeckesser/scipy,vigna/scipy,vigna/scipy,e-q/scipy,scipy/scipy,matthew-brett/scipy,Eric89GXL/scipy,andyfaff/scipy,Eric89GXL/scipy,anntzer/scipy,Eric89GXL/scipy,pizzathief/scipy,rgommers/scipy,matthew-brett/scipy,mdhaber/scipy,pizzathief/scipy,perimosocordiae/scipy,vigna/scipy,zerothi/scipy,scipy/scipy,tylerjereddy/scipy,mdhaber/scipy,endolith/scipy,nmayorov/scipy,Stefan-Endres/scipy,e-q/scipy,scipy/scipy,Eric89GXL/scipy,zerothi/scipy,scipy/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,anntzer/scipy,Stefan-Endres/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,rgommers/scipy,perimosocordiae/scipy,andyfaff/scipy,andyfaff/scipy,pizzathief/scipy,endolith/scipy,nmayorov/scipy,e-q/scipy,tylerjereddy/scipy,matthew-brett/scipy,zerothi/scipy,anntzer/scipy,tylerjereddy/scipy,ilayn/scipy,endolith/scipy,Eric89GXL/scipy,rgommers/scipy,andyfaff/scipy,scipy/scipy,andyfaff/scipy,mdhaber/scipy,endolith/scipy,Stefan-Endres/scipy,zerothi/scipy,tylerjereddy/scipy,WarrenWeckesser/scipy,rgommers/scipy,ilayn/scipy,nmayorov/scipy,grlee77/scipy,pizzathief/scipy,nmayorov/scipy,ilayn/scipy,endolith/scipy,Eric89GXL/scipy,scipy/scipy,WarrenWeckesser/scipy