Kill the SP macro in preperation for xcurses support

src/sbbs3/scfg/scfg.c

src/sbbs3/scfg/scfgchat.c

src/sbbs3/scfg/scfgmdm.c

src/sbbs3/scfg/scfgmsg.c

src/sbbs3/scfg/scfgsub.c

src/sbbs3/scfg/scfgsys.c

src/sbbs3/scfg/scfgxfr2.c

src/sbbs3/scfg/scfgxtrn.c