Try to solve the problem of spurious EOF chars in long lines of text
sent to interactive subprocesses. * sysdep.c (child_setup_tty): Do not enable ICANON any more. (system_process_attributes): Remove unused var `ttotal'. * process.c (send_process): Don't bother breaking long line with EOF chars when talking to ttys any more. (wait_reading_process_output): Output a warning when called in such a way that it could block without being interruptible.
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