event_teardown(): retry uv_loop_close() instead of abort. #2903

abort() causes a bad exit; retry uv_loop_close() instead.

Before this change, this ruby script will cause nvim to abort() instead
of exiting cleanly:
```
  require 'open3'
  require 'base64'

  Open3.popen3('nvim --embed -u -NONE') {|stdin, stdout, stderr, wait_thr|
    # base64-encoded msgpack message for the vim_command "qa!".
    stdin.write Base64.decode64('kwKrdmltX2NvbW1hbmSRo3FhIQ==')
    puts wait_thr.value
  }
```

References ##2663
Closes #2466
Closes #2648

Helped-by: Rui Abreu Ferreira <raf-ep@gmx.com>

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