changed start to Start and start_default to Start_default to

changed start to Start and start_default to Start_default to
avoid conflicts with start defined in crt0.o

SCCS-vsn: contrib/ed/c.c 5.4
SCCS-vsn: contrib/ed/d.c 5.4
SCCS-vsn: contrib/ed/e.c 5.5
SCCS-vsn: contrib/ed/ed.h 5.5
SCCS-vsn: contrib/ed/equal.c 5.4
SCCS-vsn: contrib/ed/g.c 5.5
SCCS-vsn: contrib/ed/i.c 5.4
SCCS-vsn: contrib/ed/main.c 5.6
SCCS-vsn: contrib/ed/j.c 5.4
SCCS-vsn: contrib/ed/input_lines.c 5.7
SCCS-vsn: contrib/ed/k.c 5.4
SCCS-vsn: contrib/ed/l.c 5.5
SCCS-vsn: contrib/ed/m.c 5.4
SCCS-vsn: contrib/ed/p.c 5.4
SCCS-vsn: contrib/ed/q.c 5.4
SCCS-vsn: contrib/ed/t.c 5.4
SCCS-vsn: contrib/ed/w.c 5.4
SCCS-vsn: contrib/ed/sub.c 5.4
SCCS-vsn: contrib/ed/z.c 5.5