[PATCH 17/19 v2] Use IS_IN only when _LIBC is defined

[Siddhesh Poyarekar]

On Fri, Nov 07, 2014 at 03:33:33PM -0800, Roland McGrath wrote:
> Use #if defined _LIBC && IS_IN (...) rather than nesting.
> Otherwise OK.

That doesn't work - the compiler complains about IS_IN not being
defined.  That is why I had to nest it.

Siddhesh
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