Unify the two branches, with and without subprocesses.
process.c: Reshuffle #include's. Condition some of the global and static variables on `subprocesses'. (hold_keyboard_input, unhold_keyboard_input, kbd_on_hold_p): Leave only one implementation. (Fget_buffer_process, Fprocess_inherit_coding_system_flag) (kill_buffer_processes, Flist_system_processes) (Fprocess_attributes, init_process, syms_of_process): Unify the implementations for with subprocesses and without them.
Showing with 518 additions and 721 deletions