* automake.in ($cygnus_mode): Replace with $options{'cygnus'}.

* automake.in ($cygnus_mode): Replace with $options{'cygnus'}.
Adjust all dependencies.
(&depend): Move next to %dependencies.
(&initialize_per_input): Initialize the 'cygnus' field of
'%options' to spare the code from 'exists' or 'defined' when
testing it.