* infrun.c, remote-eb.c, remote-nindy.c, remote-vx.c: Remove

* infrun.c, remote-eb.c, remote-nindy.c, remote-vx.c:  Remove
unused START_INFERIOR_HOOK.

* remote-eb.c:  Change timeout to 24 seconds (*10 fits in byte)
to account for slow loading from floppies.
(eb_create_inferior):  New fn, from eb_start and
nindy_create_inferior.
(eb_close):  Only use log_file if nonzero.
(eb_xfer_memory):  If not writing, then read!
(eb_read_inferior_memory, eb_write_inferior_memory):  Return length.
(eb_kill):  A new no-op.
(eb_mourn_inferior):  Remove breakpoints, then generically weep.