[PATCH 3 of 8 v2] cleanup: replace hasattr() usage with getattr() in hghave

[Bryan O'Sullivan]

On Sat, May 12, 2012 at 7:03 AM, Brodie Rao <brodie at sf.io> wrote:

>
>  def has_fifo():
> -    return hasattr(os, "mkfifo")
> +    return getattr(os, "mkfifo", None) is not None
>

Why?
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